Figure 1,,,,,
"Domestic Air Revenue Freight Ton-Miles, Population, and Real Gross Domestic Product: 1991–2000",,,,,
(Index: 1991 = 100),,,,,
Year,Domestic revenue freight ton-miles,RTMs/pop-ulation,Real GDP (chained 1996 dollars),RTMs/real GDP,Resident Population
1991,100.0,100.0,100.0,100.0,100.0
1992,110.6,109.3,103.0,107.3,101.1
1993,120.6,118.0,105.8,114.0,102.2
1994,133.3,129.1,110.1,121.1,103.2
1995,141.3,135.6,113.0,125.1,104.2
1996,144.8,137.7,117.0,123.8,105.2
1997,154.0,145.0,122.2,126.0,106.2
1998,156.8,146.3,127.4,123.0,107.2
1999,160.3,148.1,132.7,120.9,108.3
2000,168.7,151.4,138.2,122.1,111.4
KEY: RTMs = revenue ton-miles; GDP = gross domestic product.,,,,,
"SOURCES: 1991–1995: U.S. Department of Transportation, Federal Aviation Administration, Airport Activity Statistics of Certificated Route Air Carriers (Washington, DC: Various years).

1996–2000: U.S. Department of Transportation, Bureau of Transportation Statistics, Airport Activity Statistics of Certificated Air Carriers (Washington, DC: Various years).",,,,,