key: cord-0846200-z5jbdpd1
authors: Fredriksson, Per G.; Mohanty, Aatishya
title: COVID-19 Regulations, Political Institutions, and the Environment
date: 2021-11-25
journal: Environ Resour Econ (Dordr)
DOI: 10.1007/s10640-021-00628-z
sha: fe0825a62fd1d26ed39372d29dd0fe154be9ccaf
doc_id: 846200
cord_uid: z5jbdpd1

The COVID-19 pandemic was associated with short-term air quality improvements in many countries around the world. We study whether the degree of democracy and political institutions played a role. We provide novel empirical evidence from 119 countries. A given stringency of COVID-19 containment and closure policies had a stronger effect on air quality in more democratic countries, and in countries with majoritarian rather than proportional electoral rules. Our estimates suggest that the improvement in air quality was around 57% greater in majoritarian systems than in proportional systems. Confidence in government, trust in politicians, and social capital also affected outcomes.

The COVID-19 outbreak was declared a global pandemic by the WHO on March 11, 2020. Government responses resulted in lockdowns and mobility restrictions, which led to shortterm reductions in air pollution. In this paper, we study the role of democracy and electoral rules for the short-term improvements in air quality resulting from COVID-19 policies. To the best of our knowledge, this is a novel contribution to the literature.

The literature provides estimates of the changes in air quality resulting from the COVID-19 pandemic. Brodeur et al. (2021) find that particulate matter concentration levels declined by approximately 25% in the US and Europe. Sharma et al. (2020) report decreases of PM 2.5 , PM 10 , CO 2 , and NO 2 of between 10 to 43% in Indian cities, and Li et al. (2020) and report similar declines in China. In contrast, Dang and Trinh (2021) report that across 164 countries, NO 2 and PM 2.5 levels fell by only 5 percent and 4 percent, respectively, and that mobility restrictions explain these findings. Meanwhile, the political science, psychology and medical literatures argue that a population's response to a crisis such as the pandemic depends on citizens' trust in government, political institutions, and science (Woelfert and Kunst 2020; Schraff 2021; Esaiasson et al. 2021; Groeniger et al. 2021) . Consistent with this view, trust in institutions and government affected adherence to social distancing policies during the Ebola outbreak in Liberia, e.g. (Blair et al. 2017) . We test the hypothesis that changes in air pollution resulting from government COVID-19 restrictions depended on the level of democracy and democracies' electoral system. In particular, we focus on proportional and majoritarian electoral systems. We thus help fine-tune our understanding of the short-term impacts on air pollution, a research focus emphasized by, e.g., Helm (2020) and Lee (2021) .

If citizens' political trust is higher in democratic governments, compliance with regulations, changes in mobility patterns, and associated pollution reductions should be higher (Marien and Hooghe 2011; Eichengreen et al. 2021 ). However, the system for selection of government may matter in democracies. In proportional electoral systems, government leadership tends to be more fractionalized than in majoritarian electoral systems. The political and scientific views are likely to differ, resulting in more inconsistent messaging provided by coalition governments (Sagarzazu and Kluver 2017) . Differentiated communication and political infighting among government parties are likely to reduce political trust in government in proportional systems. In majoritarian systems, messaging and management during a crisis may be expected to be more in unison and clear, resulting in greater political trust and compliance. 1 These differences may be particularly acute during a crisis such as a pandemic. A crisis may also give rise to "rally-around-the-flag" effects where the government is trusted to a greater degree (Dinesen and Jaeger 2013; Esaiasson et al. 2020; Schraff 2021; Groeniger et al. 2021) . Flückiger et al. (2019) show that during the West African Ebola epidemic, trust in government increased with exposure to the epidemic. Using survey data from seven Western European countries, Bol et al. (2021) estimate that lockdowns increased satisfaction with democracy and trust in government by around 2.4-3.2%, and intentions to vote for the party of the head of government rose by 4.1-4.3% (with a total increase of 6% for all governing political parties). However, the 2008 global financial crisis reduced trust in governments according to Earle (2009) . Similarly, Skali et al. (2021) find that when Switzerland (with a proportional electoral system) faced crisis during war time, trust in the government declined.

Our empirical work helps shed light on whether rally-around-the-flag effects differ across proportional and majoritarian systems, with consequent differential effects on environmental quality. We provide random effects estimates using panel data from a total of 119 countries. As a measure of air quality, we utilize daily values of satellite-based aerosol optical depth (AOD) from NASA (Platnick et al. 2015) for the period January 3-June 30, 2020. To estimate the change in AOD, the median value of AOD on the same day of the week (e.g., Monday) from January 3-February 6, 2020, is used as the baseline. The regulatory measure is the COVID-19 Stringency Policy Index by Hale et al. (2020) and Polity V is our main democracy measure (Marshall and Jaggers 2018) .

The estimations suggest that a given increase in the stringency of COVID-19 policies on average reduced daily AOD levels, but the decline was greater in more democratic countries. Within the group of democracies, the marginal AOD reductions were smaller in countries with proportional electoral rules compared to those with majoritarian systems. To help explain these findings, we show differential responses in community mobility. Mobility changes were measured at transit stations, groceries and pharmacies, and workplaces (data provided by Google 2020).

Next, we control for pre-COVID-19 (baseline) levels of confidence in government, trust in politicians, and social capital. Our results for democracies, proportional and majoritarian systems remain robust overall. COVID-19 policies reduced both AOD and mobility by more in countries with greater confidence in government and trust in politicians. Thus, there were rally-around-the-flag effects in countries with these characteristics. However, although social capital reinforced a decline in air pollution, this was not due to the mobility changes included in the analysis. The estimations suggest that the decline in mobility was slightly lower in countries with high social capital. One potential explanation may be that populations in countries with high social capital believed that others within their community would stay socially distant and wear masks, and they therefore would not need to comply and reduce their own mobility to the same degree. Moreover, Woelfert and Kunst (2020) report that social trust was related to a higher growth rate of infections in a study of 65 countries. It appears that in countries with high social capital the decline in air quality occurred to a higher degree via other channels such as declines in industrial production, construction, and long-range transportation (Li et al. 2020) . However, the mobility changes help explain the overall impacts of COVID-19 regulations on air quality in democracies, and in proportional and majoritarian systems.

Our results are robust to controlling for risk exposure, the capacity of the health care sector, legal origins, colonial history, and institutional quality. While the literature has previously discussed the relationship between democracy, political institutions, and environmental quality and policy (e.g., Folke 2014; Kammerlander and Schulze 2020; Ang and Fredriksson 2021; Hu and Chen 2021) , to our knowledge the questions addressed in the present paper are novel. We believe our findings broaden our understanding of the environmental (and health) effects of government policymaking, in particular during a crisis situation.

The paper is organized as follows. Section 2 discusses the empirical specification and data, and Sect. 3 reports the baseline results. Section 4 introduces measures of government confidence, trust and social capital into the baseline models. Section 5 shows how changes in mobility, conditional on democratic institutions, help explain the changes in pollution. Section 6 reports robustness analysis based on potential vulnerabilities, institutions, demography, instrumental variables, and excluding regions, respectively. Section 7 concludes.

The following random-effects panel data model is estimated:

AOD is an index of aerosol optical depth in country i on day t, Stringency (lagged one day) is a measure of the rigor of government-imposed policies, Electoral rules is a dummy (1)

variable representing proportional or majoritarian electoral system, Democracy is a measure of the degree of democracy, and cv ′ is a set of control variables which are included both individually and also interacted with Stringency. i captures the random disturbance of the ith country, which is constant over time and independent across countries. The specification also allows for time fixed effects, t . i,t is the idiosyncratic error term. 2 Daily values of satellite-based aerosol optical depth (AOD) from NASA (Platnick et al. 2015 ) measure air quality within the period January 3-June 30, 2020. AOD measures the degree to which the dispersion of the solar beam is hindered due to the presence of pollution particles (dust, haze) in the atmosphere (NOAA 2020). Data are drawn from the moderate resolution imaging spectroradiometer (MODIS) aboard NASA's Terra satellite. An AOD value of 0.01 indicates a clean and clear sky, 0.5 is hazy, and values of 1-3 or greater correspond to highly polluted air. For instance, on 11th February 2020, Norway had an average AOD value of 0.05, Bangladesh was at 0.6, while Ghana recorded an average AOD value of 2.5. We construct the AOD variable by measuring the change in AOD on a day relative to baseline days, where a baseline day is the median value of AOD on the same day of the week (e.g., Monday) from January 3-February 6, 2020. A negative AOD value indicates a decrease in pollution relative to the baseline period, while a positive value reflects an increase in pollution. The baseline period is selected such that few countries had taken strong action yet. The subsequent study period, February 7-June 30, 2020, is chosen mainly due to data availability, but has the advantage that major investments or changes in trade and demand patterns are less likely to strongly influence our results.

AOD provides an indirect but precise proxy of air quality. While PM 2.5, NO 2 and CO 2 are common measures of air pollution in the literature, we use AOD data due to its wide geographic and temporal coverage. Multiple previous studies have relied on AOD data as a measure of air quality, and also demonstrated a positive correlation between AOD, PM2.5 and PM10 (see, e.g., Hutchison 2003; Engel-Cox et al. 2004; Hu and Rao 2009; Gutierrez 2010; Khoshsima et al. 2014 , Kong et al. 2016 ). Using AOD data has advantages in comparison to the sparse coverage by other air quality measures. For example, AOD appears preferable to PM2.5, which is dependent upon the availability of ground-level air quality monitoring stations; their coverage differ across regions depending on geographic and economic factors (Shi et al. 2018) . Furthermore, since aerosols are also known to disrupt atmospheric stability and hydrological cycles, it provides us with added information on air quality (Li et al. 2007; IPCC, 2013) . Figure 1 shows the spatial distribution of AOD across countries.

We use the COVID-19 Stringency Policy Index by Hale et al. (2020) , which measures regulations including school closings, workplace closings, cancellation of public events, restrictions on gatherings, closure of public transport, stay at home requirements, restrictions on internal movement, international travel controls, and provision of public information campaigns. For example, the raw sub-index for school closings ranges between 0 and 3:0 (no measures); 1 (recommended closing); 2 (required closing, but only for some school types or age groups, e.g., just high schools or just public schools); 3 (required closing of all levels). The sub-index for closure of public transport may take three different values: 0 (no measures); 1 (recommended closing, or significantly reduce volume/route/means of transport available); 2 (required closing, or prohibit most citizens from using public transport). Moreover, the value for each measure is interacted with an indicator variable which takes a value of zero if the measure is targeted only locally, and unity if the policy applies generally. The daily variable is constructed by measuring the change in Stringency relative to the baseline day, the median value on the same day of the week January 3-February 6, 2020. The index is then rescaled from 0 to 1. A positive value of Stringency indicates an increase in the stringency of policies relative to the baseline period. Figure 2 shows the spatial distribution of Stringency across countries. The mean of Stringency is 0.44 and 0.45 in democracies and autocracies, respectively. IDEA (2018) provides data on electoral systems; Marshall and Jaggers (2018) provide the Polity V democracy measure. We rescaled the original Polity V scale from -10 to 10, to 0 to 10, where a higher value reflects a stronger democracy. We define autocracies as countries with a score in the 0 to 2 range, and democracies as those with a score above 2. We have data on 49 proportional system democracies, 24 majoritarian system democracies, 6 proportional system autocracies, and 13 majoritarian system autocracies (IDEA 2018). We also have 20 democracies (e.g., Germany, Italy, Japan and South Korea) and 7 autocracies that are neither proportional nor majoritarian systems.

The control variables are the share of the manufacturing sector in GDP, vehicles/1000 inhabitants, climate change policy stringency, KOF globalization index, GDP/capita. These variables control for the level of pollution related to polluting production and consumption, transportation, environmental regulations, and trade patterns (Shapiro and Walker 2018; Wang 2021) . The controls are entered individually and as Stringency interactions. 

Columns (1)-(3) in Table 1 provide baseline estimates of the effect of Stringency on AOD, including the interactions with Democracy, Proportional, and Majoritarian. The sample includes all autocracies. The marginal effect of Stringency is reported in each column. Column (1) suggests that Stringency has a negative effect on AOD, and the effect is stronger the higher the level of Democracy. Next, the effect of Stringency is smaller in proportional systems than in majoritarian systems. The estimate in column (2) This table reports random-effect estimates using data at the country-day level. The Hausman test is validated in all models. Standard errors in parenthesis. *, ** and *** indicate significance at the 10%, 5% and 1% levels, respectively. Baseline control variables are included individually and in interactions with Stringency:

share of manufacturing, vehicles per 1000 inhabitants, climate change stringency policy (CCPS), KOF globalization index, and GDP per capita Table 1 (continued) Marien and Hooghe (2011) report that lower levels of political trust are associated with lower compliance with the law. The general population's response to the pandemic depends on their trust in government, political institutions, and science (Esaiasson et al. 2021; Schraff, 2021; Woelfert and Kunst, 2020; Groeniger et al. 2021) . However, the level of trust may change as a result of the pandemic (Bol et al. 2021; Skali et al. 2021 ). Here we study whether a given stringency of COVID-19 policies have differential effects on pollution, conditional on pre-pandemic levels of trust. We also study whether the effect of stringency depends on several forms of trust, yielding rally-around-the-flag effects. Table 2 includes measures of the degree of confidence in government and the level of trust in politicians. Government Confidence (columns (1)-(3)) and Trust in Politicians (columns (4)- (6)) are the national averages of individual WVS (2015) and World Economic Forum (2017) survey responses, respectively. In columns (7)-(9), we utilize Social Capital from the World Economic Forum (2018), which measures trust among the general public and society overall. It may provide a partial or indirect measure of trust in government. These three baseline measures were created before the COVID-19 pandemic. Including these in the analysis helps us detect if rally-around-the-flag effects depended on preexisting trust. Moreover, we are more likely to be able to discern differences in behavioral responses to changes in Stringency between proportional versus majoritarian systems, since the Stringency measure applies exclusively to the COVID-19 pandemic.

According to all columns in Table 2 , the effect of Stringency on AOD is greater in democracies. Moreover, accounting for confidence in government and trust in politicians, the differential effect across proportional and majoritarian systems of Stringency remains. For example, according to column (2), at the mean values of Confidence in Government and Democracy (including the insignificant direct effect of Stringency), the estimated marginal effect of one standard deviation change in Stringency equals − 0.127 in proportional systems. According to column (3), in majoritarian systems the marginal effect equals − 0.141 (including the insignificant direct effect of Stringency). Thus, the marginal change is 11% greater in majoritarian systems. 4 Moreover, Stringency has a more negative effect on AOD the greater the level of Government Confidence, Trust in Politicians, and Social Capital. This indicates rally-around-the-flag effects.

In this section, we study whether changes in mobility help explain the estimated effects. To measure the effect of Stringency on mobility, we use data on mobility trends from the Google Community Mobility Reports (Google 2020) . Mobility reductions are measured at transit stations, groceries and pharmacies, and workplaces. The change in the daily movement in each of these areas is compared to the baseline day, defined as the median value of movement in an area on the same day of the week during the time period January 3-February 6, 2020. Table 2 Democratic institutions, confidence in government, trust in politicians, social capital, and air pollution (1) Columns (1)-(3) in Table 3 use the percentage reduction in mobility at transit stations as a dependent variable, columns (4)-(6) use the percentage reduction in workplace mobility, and columns (7)-(9) employ the percentage reduction in mobility in groceries and pharmacies. Columns (10)-(12) use an average of the mobility changes in columns (1)-(9). The marginal effects of Stringency are calculated taking all interactions into account (not all coefficients reported).

All columns in Table 3 suggest that the marginal effect of Stringency on mobility reductions is lower in more democratic countries. Thus, the greater effects of Stringency on air pollution in democracies found in Tables 1 and 2 are not due to mobility changes of the forms studied here. The greater civil liberties enjoyed in democracies may have resulted in a lower level of compliance with mobility restrictions. The stringency measures implemented in democracies may also have had a different focus or been enforced less strictly, therefore having a relatively smaller effect on mobility. Moreover, we may have incomplete data on mobility reductions. For example, emissions from international air travel and the manufacturing sector may have fallen more in democracies. Saha et al. (2017) find that the level of civil liberties was positively correlated with inbound tourism in 110 countries during 1995-2012. A sharper decline in tourism and international travel in democracies may help explain our findings. In addition, Acemoglu et al. (2019) find that democracy has a positive effect on per capita GDP and capital investments. The marginal effect of COVID-19 restriction on economic activity and pollution may therefore have been relatively larger. Note also that relative to the direct effect of Stringency, the effect of democracy is quite small, except perhaps in columns (7)-(9). Next, the differential effects in proportional and majoritarian systems are consistent with the results for AOD in Tables 1 and 2. For example, according to the estimates in column (2), the marginal reduction in mobility of a one standard deviation increase in Stringency in proportional systems equals 8.381. This is 29.5% of a standard deviation of mobility at transit stations. Based on column (3), the corresponding effect in majoritarian systems equals 10.616, or 37.3%. The pattern is similar in columns (5)-(6), (8)-(9) and (11)-(12). Thus, the effects of more stringent COVID-19 regulations on mobility are relatively smaller in proportional systems than in majoritarian systems. This helps explain the differential effects on AOD. Table 4 investigates the effect of stringency on mobility, taking institutions and culture into consideration. The average mobility index (from Table 3 ) is utilized in all columns. Columns (1)-(3) utilize our measure of confidence in government, columns (4)-(6) employ the measure of trust in politicians, and columns (7)-(9) include our measure of social capital. The impact of Stringency on mobility remains lower in democracies (except in columns (1)-(3) with insignificant Democracy interactions, perhaps due to a decline in observations) and proportional systems, but greater in majoritarian systems and where trust in government and government confidence are higher. 5 This indicates that rally-around-theflag effects occurred in such countries. Columns (7)-(9) suggest that the marginal effect of Stringency on mobility is relatively smaller where social capital is greater. The population in these countries potentially had a harder time giving up social activities. Alternatively, they may have believed that other citizens would practice social distancing, wear protective See Table 1 masks, and stay safe, and they therefore would not need to reduce their own mobility to the same extent. 6 This appears consistent with Woelfert and Kunst (2020), who in a study of 65 countries find that social trust was related to a higher growth rate of infections. In these countries, the decline in air quality may to a higher degree have occurred via other channels such as declines in industrial production, construction, and long-range transportation (Li et al. 2020 ). However, the mobility changes do help explain the overall impacts of COVID-19 regulations on air quality in democracies, and in proportional and majoritarian systems. 6 Robustness Analysis

In this section, we control for vulnerabilities that may affect behavior and thus the effect of regulations on pollution during the pandemic. Columns (1)-(2) in Table 5 control for risk exposure. This is the first principal component of three measures that reflect risk exposure: population density, net migration and urbanization (see, e.g., Noy et al. 2020 ). In columns (3)-(4) we control for the health system capacity specific to COVID-19 and in columns (5)-(6) for country-level health system capacity in general. In all cases, the results are consistent with our baseline findings.

The efficacy of government interventions can vary greatly based on legal origin, institutional quality and colonial origin (Fredriksson and Wollscheid 2015; La Porta et al. 2018; Ang and Fredriksson 2021) . We control for these factors in Table 6 . The results remain robust. The marginal effect of Stringency on AOD is stronger the greater is Democracy and in majoritarian systems. The marginal effect is relatively weaker in proportional systems. 

Next, we look at demographic variables that may affect stringency during the pandemic: population density, urbanization and human capital. Table 7 shows that in all cases the baseline results remain robust to the addition of the demographic confounders.

In this section, we provide instrumental variable estimates to mitigate concerns about endogeneity. First, we use the daily cumulative number of COVID-19 cases as an instrument for Stringency. This is a suitable instrument as stringency regulations were progressively raised with increases in COVID-19 cases. However, the cumulative number of cases is also unlikely to directly lead to AOD changes, and this IV is therefore likely to satisfying the exclusion restriction. All control variables interacted with Stringency are also instrumented. The IV-2SLS results are reported in panel (a) in Table 8 . Columns (1)-(2) use the cumulative number of COVID-19 cases lagged by one day, and columns (3)-(4) lag the instrument by five days. The lags account for the time it takes to implement and make social mobility restrictions effective. The results are largely consistent with the main findings. Second, we utilize a measure of the potential increase in crop yield due to irrigation in agriculture (irrigation potential) as an instrument to exploit the exogeneous variation of democracy. Bentzen et al. (2017) compile this measure of irrigation potential based on data from the Food and Agriculture Organization's (FAO) global Agro-Ecological Zones (GAEZ) 2002 database. Bentzen et al. (2017) find that countries with greater irrigation potential are less democratic in the present day. The IV-2SLS results reported in panel (b) of the Table 8 remain robust. Using the critical values provided by Stock and Yogo (2005) , the Cragg and Donald (1993) weak identification test rejects the null that the instruments are only weakly correlated with the endogenous regressors. The Anderson-Rubin (1949) and Stock-Wright (2000) tests reject the null hypothesis (at the 1% level) that the coefficients of the excluded instruments are jointly equal to zero. This indicates that the excluded instruments are statistically significant.

In Table 12 in the Appendix we study whether our main results are sensitive to excluding regions. Sequentially, we drop countries in Asia (columns (1)-(3)), Africa (columns (4)-(6)), the Americas (columns (7)-(9)), Europe (columns (10)-(12)), and Oceania (columns (13)-(15)). The main results remain consistent overall. However, while the interactions of interest remain significant with consistent signs when we exclude the African continent, the direct effect of Stringency is positive. 7 

In this paper, we test the hypothesis that the effect of COVID-19 regulations on air pollution is conditional on the level of democracy and on electoral rules. By controlling for the level of confidence in government, trust in politicians, and social capital, we seek to understand whether any rally-around-the-flag effects occurred. We find that a given COVID-19 policy stringency yielded improvements in air quality roughly 57% greater in majoritarian systems than in proportional systems. Mobility effects help explain this pattern. During the crisis, majoritarian systems appear to have experienced rally-around-the-flag effects, encouraging adherence with COVID-19 regulations to a greater degree than in proportional systems. Confidence in government, trust in politicians and social capital also impact the regulatory effects on mobility and air quality. 

Aerosol Optical Depth (AOD) measures the level to which polluting particles in the air absorb the sunlight and reduce visibility. A higher concentration of aerosols in the atmosphere indicates poorer air quality. AOD is constructed by measuring the change in AOD on a day relative to baseline days, where a baseline day is the median value of AOD on the same day of the week (e.g., Monday) from January 3 -February 6, 2020. Aerosol particles include smoke from factories, from fires, dust from dust storms, volcanic ash and smog. The combined deep target and deep blue AOD for land and ocean at 0.55 microns wavelength are used (MOD08_D3 v6.1). It has a daily temporal resolution and a spatial resolution of one degree. The data is monitored and recorded by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite Platnick et al. (2015) Stringency A daily composite index measuring the rigor of government-imposed containment actions by focusing on nine related indicators: closure and containment of (i) schools, (ii) workplaces, (iii) public events, (iv) restriction on gathering size, (v) closure of public transport, (vi) stay-at-home and home quarantine orders, (vii) restriction on internal movements, (viii) restriction on international travel and (ix) implementation of public information campaign. The index is used for the period January 3-June 30, 2020. The daily variable is constructed by measuring the change in Stringency relative to the baseline day, the median value on the same day of the week January 3-February 6, 2020. The index is scaled from 0 to 1 where a higher value corresponds to greater increase in stringency Hale et al. (2020) Electoral System Two binary variables for proportional and majoritarian electoral systems which classify a country' 

Mobility at transit stations is measured as the change in the movement in transit stations on a particular day as compared to the baseline day. A baseline day is the median value of movement in an area on the same day of the week between January 3, 2020 and February 6, 2020

Google (2020) Workplace mobility Mobility at workplace is measured as the change in the movement in workplaces on a particular as compared to the baseline day. A baseline day is the median value of movement in an area on the same day of the week between January 3, 2020 and February 6, 2020

Google (2020) Groceries and pharmacies mobility Mobility at groceries and pharmacies is measured as the change in the movement in groceries and pharmacies on a particular as compared to the baseline day. A baseline day is the median value of movement in an area on the same day of the week between January 3, 2020 and February 6, 2020

Google (2020) (2020) Human capital index Defined as "the amount of human capital that a child can be expected to attain by age 18, given the risks of poor health and poor education that prevail in the country where she lives" World Bank (2020)

The daily cumulative number of confirmed COVID-19 cases for the period January 3-June 30, 2020, in each country. The variable is expressed in natural logs Dong et al. (2020) Irrigation Potential Share of arable land where irrigation more than doubles agricultural yield Bentzen et al. (2017) 

Excluding regions

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The authors thank the three insightful referees, James Ang, Cooper Day, Jose Fernandez and Cheng Keat Tang for useful comments and suggestions, the co-editor Grischa Perino for helpful guidance and suggestions, and Catherine Lewis for research assistance. The usual disclaimers apply.

See Tables 9, 10, 11, 12.