Bureau of Transportation Statistics (BTS)
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Appendix B Social and Economic Characteristics of the United States

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  1980 1985 1990 1995 2000 2005
Total U.S. Resident Population (thousands) 227,225 237,924 249,623 266,278 282,193 296,410
Population by age (thousands)            
Under 18 63,754 62,623 63,949 69,465 72,307 73,470
18-24 years 30,022 28,902 26,961 25,482 27,141 29,307
25-34 years 37,082 41,696 43,174 45,052 39,895 40,143
35-44 years 25,634 31,691 37,444 42,711 45,150 43,863
45-54 years 22,800 22,460 25,062 31,480 37,674 42,483
55-64 years 21,703 22,135 21,116 21,320 24,273 30,356
65 and over 25,550 28,415 31,084 33,769 34,992 36,790
Population by sex (thousands)            
Male 110,053 115,730 121,284 130,215 138,056 146,000
Female 116,493 122,194 127,507 136,063 143,368 150,411
Population in Metropolitan areas (millions)            
Large (over 1 million) 119 U 139 147 149 U
Medium (250,000-999,999) 41 U 41 44 56 U
Small (less than 250,000) 17 U 18 19 28 U
Population in Regions (millions)            
Northeast 49.1 49.9 50.8 52.3 53.6 54.6
South 75.4 81.4 85.5 93.2 100.2 107.5
Midwest 58.9 58.8 59.7 62.5 64.4 66.0
West 43.2 47.8 52.8 58.3 63.2 68.3
Immigrants admitted (thousands) 531 570 1,536 720 841 1,122
Gross domestic product
(chained $ 2000 billions)
5,162 6,054 7,113 8,032 9,817 11,135
Civilian labor force (thousands) 106,940 115,461 125,840 132,304 142,583 149,320
Participation rate of men (%) 77.4 76.3 76.4 75.0 74.8 73.3
Participation rate of women (%) 51.5 54.5 57.5 58.9 59.9 59.3
Unemployment rate (% of labor force) 7.1 7.2 5.6 5.6 4.0 5.1
Households (thousands) 80,776 86,789 93,347 98,990 104,705 113,343
Average size of households 2.76 2.69 2.63 2.65 2.62 2.57
Median household income (constant $ 2005) 39,739 40,868 43,366 43,346 47,599 46,326
Average household expenditures (constant $ 2004) U 41,238 41,019 39,991 41,735 U

KEY: U= data are unavailable.

NOTES: Resident population estimates are as of July 1 except 1980, 1990, and 2000, which are as of April 1. New metropolitan area definitions were published by the Office of Budget and Management (OMB) in 2003. These definitions were applied to population data by the Census Bureau beginning with the data from the 2000 Census. A new term, core based statistical areas (CBSAs), collectively refers to metropolitan and micropolitan statistical areas. A metropolitan statistical area is defined as having at least one urbanized area of 50,000 or more inhabitants. A micropolitan statistical area is defined as having at least one urban cluster of more than 10,000 but less than 50,000 inhabitants.
Number of immigrants is based on fiscal year data ending September 30.
Median household income and average household expenditures were converted to constant 2004 dollars using the CPI-U-RS price index.

SOURCES: U.S. resident population—U.S. Census Bureau, Statistical Abstract of the United States 2006 (Washington, DC: 2006), table 2. Population by age, Population by sex—U.S. Census Bureau, Statistical Abstract of the United States (Washington, DC: various years), table 11. Population by metropolitan area— 2000-04: U.S. Census Bureau, Population Division, Annual Estimates of the Population of Metropolitan and Micropolitan Statistical Areas (Washington, DC: January 2006), table 1, Internet site http://www.census.gov/population/www/estimates/Estimates%20pages_final.html as of Mar. 7, 2006. Population in regions— U.S. Census Bureau, Statistical Abstract of the United States 2006 (Washington, DC: 2006), table 17.
Number of immigrants admitted—U.S. Census Bureau, Statistical Abstract of the United States (Washington, DC: various years), table 5.

Gross Domestic Product— U.S. Census Bureau, Statistical Abstract of the United States 2006 (Washington, DC: 2006), table 650.
Civilian Labor Force, Unemployment Rate— U.S. Census Bureau, Statistical Abstract of the United States 2006 (Washington, DC: 2006), table 576. Participation of Men and Women—

Number of households, Average size of households—U.S. Department of Commerce, Bureau of the Census, Current Population Survey, Table HH-6, Average Population Per Household and Family: 1940 to Present, Internet site http://www.census.gov/population/socdemo/hh-fam/hh6.pdf as of August 2006.

Median household income— U.S. Department of Labor, Bureau of the Census, Current Population Survey, Table H-5, Race and Hispanic Origin of Householder--Households by Median and Mean Income: 1967 to 2004, Internet site http://www.bls.gov/cex/2004/standard/multiyr.pdf as of Jan. 16, 2006. Average household expenditures— U.S Department of Labor, Bureau of Labor Statistics, Consumer Expenditure Survey, Average Annual Expenditures, All Consumer Units, Internet site http://www.bls.gov/data/home.htm as of Mar. 7 2006.



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