"AmericaÕs transportation system has changed along with ,,,"
"the nationÕs society and economy. The following table puts ,,,"
"those changes in perspective:,,,"

"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 StatisticsÕ Consumer 
Price Index and the Bureau of Economic AnalysisÕ chained-type 
price index. 
Key: N = data do not exist.
Note: All dollar amounts are 1996 chained dollars.

"Sources: Population, area, number of householdsÐÐU.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 incomeÐÐUSDOC, Bureau of"
"Economic Analysis; Consumer expenditures, employmentÐÐU.S. Department of Labor, Bureau"
"of Labor Statistics; Life expectancyÐÐCenters for Disease Control and Prevention, available at"
www.cdc.gov/nchs/fastats/fastats.htm.

"The Bureau of Transportation Statistics compiled the data in ,"
"this guide from multiple sources. The guide is divided into ,"
"five sections and a glossary:,"

"Transportation System Extent and Use,2"
"Transportation and Safety,4"
"Mobility,10"
"Transportation and the Economy,20"
"Transportation, Energy, and the Environment,25"
"Glossary,29"

"1,"