America's transportation system has changed along with the nation's society and economy. The following table puts those changes in perspective:
|Resident population (thousands)||226,542||284,797|
|Total area (thousands of square miles)a||3,619||3,718 (1990)|
|Total civilian labor force (thousands)||106,940||141,815|
|Real gross domestic productb||$4.9 trillion||$9.2 trillion|
|Median household incomeb, d||$32,661 (1984)||$38,426|
|Average household incomeb, c, d||$34,189 (1984)||$43,362|
|Average household expendituresb, c, d||$32,020 (1984)||$36,070|
|Number of households (thousands)||80,776||R105,480 (2000)|
|Average life expectancy (years)||73.7||P76.9 (2000)|
a 1980 data include the Great Lakes and inland and coastal water. 1990 data include inland water only. The Census Bureau tabulates area data for the decennial census years only.
b Expressed in 1996 chained dollars (see Glossary for definition).
c Earliest year available is 1984.
d BTS computations, Nov. 15, 2002.
Key: P = preliminary data; R = revised.
Sources: Population, area, number of households-U.S. Department of Commerce (USDOC), Census Bureau, Statistical Abstract of United States: 2000, available at http://quickfacts.census.gov/qfd/states/00000.html; GDP- USDOC, BEA; median household income-USDOC, Census, available at www.census.gov/hhes/www/income/histinc/ie1.html; average household income and expenditures, employment-U.S. Department of Labor, BLS, available at http://www.bls.gov/cex; life expectancy-Centers for Disease Control and Prevention, available at www.cdc.gov.