(Index: 1975 = 1.0)
Excel | CSV | Graphic Version
| Year | Air carrier | Intercity truck | Class I rail | Water | Pipeline |
|---|---|---|---|---|---|
| 1975 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| 1980 | 1.3 | 1.2 | 1.2 | 1.6 | 1.2 |
| 1985 | 1.5 | 1.3 | 1.2 | 1.6 | 1.1 |
| 1990 | 2.6 | 1.6 | 1.4 | 1.5 | 1.2 |
| 1991 | 2.6 | 1.7 | 1.4 | 1.5 | 1.1 |
| 1992 | 2.8 | 1.8 | 1.4 | 1.5 | 1.2 |
| 1993 | 3.1 | 1.9 | 1.5 | 1.4 | 1.2 |
| 1994 | 3.4 | 2.0 | 1.6 | 1.4 | 1.2 |
| 1995 | 3.6 | 2.0 | 1.7 | 1.4 | 1.2 |
| 1996 | 3.7 | 2.1 | 1.8 | 1.4 | 1.2 |
| 1997 | 3.9 | 2.3 | 1.8 | 1.2 | 1.2 |
| 1998 | 4.0 | 2.3 | 1.8 | 1.2 | 1.2 |
| 1999 | 4.0 | 2.4 | 1.9 | 1.2 | 1.2 |
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2001 (Washington, DC: 2002).