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 | 1980 | 2002 |
|---|---|---|
| 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.