Figure 41. Average commute-to-work trip length, by mode, 1969, 1977, 1983, and 1990....... 405 Figure 42. Average annual travel per driver, 1969, 1977, 1983, 405 Environmental Hazards and Human Health Risks Figure 43. U.S. production of selected synthetic organic chemicals, 1969-1990. ............ Figure 44. Figure 45 Figure 46. Environmental distribution of TRI releases, 1987-1990. 409 410 .... 410 411 Figure 1.-Aging of the U.S. population, 1940-1991. Figure 2.-Urban, suburban, and rural population of the United States, 1950-1990. Figure 3.-Population migration, by region, 1960-1990. Total U.S. Pacific coast Gulf coast Atlantic coast Great Lakes West Interior of U.S. 1990 Table 1.-Total population and population growth rate, 1900-1992. Source: U.S. Department of Commerce, Bureau of the Census, Estimates of the Population of the United States to August 1, 1992. Current Population Reports, series P-25, no. 1091, and earlier reports in this series, (Washington, DC: DOC, September 1992). Notes: The population estimates shown here are based on the April 1, 1990, population as enumerated in the 1990 census. Estimates for dates prior to April 1, 1990, have been revised. Annual population estimates are as of July 1 for the given year. Total population includes Armed Forces oversees. Related Tables: 2-6, 23, 88-90. |