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NOTE: For each year shown, first line is for current year dollar amounts (in billions). Second (italicized) line for each year is the same amount in 1996 dollars.
| Highways | Aviation | Amtrak / High-Speed Rail | Rail as percent of road-air-rail total | |
|---|---|---|---|---|
| 1997 | 20.365 | 8.489 | 0.867 | 2.9% |
| - | - | - | ||
| 1996 | 19.970 | 8.216 | 0.774 | 2.7% |
| 19.970 | 8.216 | 0.774 | ||
| 1995 | 19.879 | 8.392 | 1.017 | 3.4% |
| 20.440 | 8.629 | 1.046 | ||
| 1994 | 19.938 | 8.645 | 0.912 | 3.1% |
| 21.082 | 9.141 | 0.964 | ||
| 1993 | 18.254 | 8.862 | 0.896 | 3.1% |
| 19.795 | 9.610 | 0.972 | ||
| 1992 | 18.585 | 8.887 | 0.860 | 3.0% |
| 20.757 | 9.926 | 0.961 | ||
| 1991 | 15.088 | 8.137 | 0.815 | 3.4% |
| 17.359 | 9.362 | 0.938 | ||
| 1990 | 13.560 | 7.141 | 0.629 | 2.9% |
| 16.257 | 8.562 | 0.754 | ||
| 1989 | 12.242 | 6.390 | 0.604 | 3.1% |
| 15.470 | 8.075 | 0.763 | ||
| 1988 | 11.967 | 5.714 | 0.609 | 3.3% |
| 15.851 | 7.569 | 0.807 | ||
| 1987 | 13.305 | 5.170 | 0.619 | 3.3% |
| 17.980 | 7.132 | 0.854 | ||
| 1986 | 13.562 | 4.640 | 0.603 | 3.2% |
| 19.390 | 6.634 | 0.862 | ||
| 1985 | 14.189 | 5.184 | 0.712 | 3.5% |
| 20.663 | 7.550 | 1.037 | ||
| 1984 | 13.259 | 4.065 | 0.816 | 4.5% |
| 19.997 | 6.131 | 1.231 | ||
| 1983 | 13.465 | 4.031 | 0.815 | 4.5% |
| 21.184 | 6.342 | 1.282 | ||
| 1982 | 8.533 | 2.930 | 0.905 | 7.3% |
| 13.856 | 4.758 | 1.470 |