Introduction
Introduction
America's transportation system continues to change along with the population, work force, and economy. The following table puts those changes in perspective:
| Context | 1990 | 2006 |
|---|---|---|
| Resident population (thousand) | 248,791 | 299,398 |
| Total area (thousand sq. mi.) | 3,718 | 3,794 (2000) a |
| Total civilian labor force (thousand) | 125,840 | 151,428 |
| Real gross domestic productb (trillion) | $7.1 | $11.3 |
| Median household incomeb,c | $36,668 | $41,350 |
| Average household incomeb,c | $39,073 | $51,929 |
| Average household expendituresb,c | $35,257 | $42,204 |
| Number of households (thousand) | 93,347 | 114,384 |
| Life expectancy at birth (years) | 75.4 | 77.8 (2004) |
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 2000 chained dollars (see Glossary for definition).
c BTS computations, November 2007.
Sources: Area-U.S. Department of Commerce (USDOC), U.S. Census Bureau, Statistical Abstract of the United States: 2002 and 2007, available at www.census.gov, as of Oct. 2007. GDP-USDOC, Bureau of Economic Analysis, available at www.bea.gov, as of Oct. 2007. Population, number of households, and median household income-USDOC, Census, available at www.census.gov, as of Oct. 2007. Average household income and expenditures, and labor force-U.S. Department of Labor, Bureau of Labor Statistics, available at www.bls.gov, as of Oct. 2007. Life expectancy-Centers for Disease Control and Prevention, available at www.cdc.gov, as of Oct. 2007.