Introduction

Introduction

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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Characteristic 1970 1999
Resident population (thous.) 203,984 272,691
Total area (thous. sq. mi.) 3,619 a3,718 (1990)
Total civilian labor force (thous.) 82,771 139,368
Gross Domestic Productb $3.4 trillion $8.8 trillion
Median household incomeb $29,600 37,430 (1998)
Average household expendituresb N 34,205 (1998)
Number of households (thous.) 63,401 103,874
Average life expectancy (years) 70.8 76.5 (1997)
Labor force participation by women 46% 60%

a 1990 data reflect the inclusion of the Great Lakes, inland water, and coastal water. 1970 data include inland water only. The Census Bureau tabulates area (square miles) data for the decennial census years only.
b Converted from current dollars to 1996 chained dollars using implicit deflators constructed from the Bureau of Labor Statistics' Consumer Price Index and the Bureau of Economic Analysis' chained-type price index.
Key: N = data do not exist.
Note: All dollar amounts are 1996 chained dollars.

Sources: Population, area, number of households--U.S. Department of Commence (USDOC), Census Bureau, Statistical Abstract of United States: 1999 (Washington, DC: 1999), also available at www.census.gov; GDP, median household income--USDOC, Bureau of Economic Analysis; Consumer expenditures, employment--U.S. Department of Labor, Bureau of Labor Statistics; Life expectancy--Centers for Disease Control and Prevention, available at www.cdc.gov/nchs/fastats/fastats.htm.