America’s transportation system continues to change along with the population, work force, and economy. The following table puts those changes in perspective:
|Resident population (thousands)||226,542||288,369|
|Total area (thousands of square miles)a||3,619||3,718 (2000)|
|Total civilian labor force (thousands)||106,940||144,863|
|Real gross domestic productb||$4.9 trillion||$9.4 trillion|
|Median household incomeb, d||$32,661 (1984)||$38,186|
|Average household incomeb, c, d||$34,189 (1984)||$44,507|
|Average household expendituresb, c, d||$32,020 (1984)||$36,626|
|Number of households (thousands)||80,776||109,297|
|Life expectancy at birth (years)||73.7||P77.2 (2001)|
a 1980 data include inland water only. Since 1990, data reflect a new database and include inland water, coastal water, and Great Lakes, but exclude
territorial water. 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, December 2003.
Key: P = preliminary data.
Sources: Population, area, number of householdsU.S. Department of Commerce (USDOC), U.S. Census Bureau, Statistical Abstract of the United States: 2002, available at http://www.census.gov, as of Oct. 2003. GDPUSDOC, Bureau of Economic Analysis, available at http://www.bea.gov, as of Dec. 2003. Median household incomeUSDOC, Census, available at http://www.census.gov, as of Oct. 2003. Average household income, average household expenditures, labor forceU.S. Department of Labor, Bureau of Labor Statistics, available at http://www.bls.gov, as of Dec. 2003. Life expectancyCenters for Disease Control and Prevention, available at http://www.cdc.gov, as of Oct. 2003.