America's transportation system has changed along with the nation's society and economy. The following table puts those changes in perspective:

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Context 1980 2001
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; GDP- USDOC, BEA; median household income-USDOC, Census, available at; average household income and expenditures, employment-U.S. Department of Labor, BLS, available at; life expectancy-Centers for Disease Control and Prevention, available at