Americas transportation system continues to change along with the population, work force, and economy. The following table puts those changes in perspective:

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Context 1990 2008
Resident population (thousand) 248,791 304,060
Total area (thousand sq. mi.) 3,718 3,794 (2000)a
Total civilian labor force (thousand) 125,840 154,287
Real gross domestic productb (trillion) $8.0 $13.3
Median household incomeb,c $41,465 $46,370
Average household incomeb,c $44,160 $58,594
Average household expendituresb,c $39,338 $46,304
Number of households (thousand) 93,347 117,181
Life expectancy at birth (years)d 75.4 77.7 (2006)

a Data for 2000 include inland water, coastal water, Great Lakes, and territorial water. The Census Bureau tabulates area data for the decennial census years only. b Data in 2005 chained dollars (see Glossary for definition). c BTS computations, November 2009. d Life expectancy for 2000-2006 were calculated using a revised methodology and may differ from previously published data.

Sources: AreaU.S. Department of Commerce (USDOC), U.S. Census Bureau, Statistical Abstract of the United States: 2002 and 2009, available at as of November 2009. GDPUSDOC, Bureau of Economic Analysis, available at as of November 2009. Population, number of households, and median household incomeUSDOC, Census Bureau, available at as of November 2009. Average household income and expenditures, and labor forceU.S. Department of Labor, Bureau of Labor Statistics, available at as of October 2009. Life expectancyCenters for Disease Control and Prevention, available at as of September 2009.