Figure 1,,,,,,
Passenger-Miles of Travel,,,,,,
(Trillions),,,,,,
Year,Passenger-Miles,,,,,
1975,"2,557,177",,,,,
1980,"2,871,260",,,,,
1985,"3,202,200",,,,,
1990,"3,800,500",,,,,
1995,"4,131,300",,,,,
1999,"4,800,000",,,,,
"SOURCE: 1975–1995—various sources as cited in U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2001 (Washington, DC: 2002); 2000 data—various sources as compiled by the Bureau of Transportation Statistics.",,,,,,