(Index: 1990 = 1.0)
Excel | CSV | Graphic Version
| Year | Passenger car | Motorcycle | Other 2-axle 4-tire vehicle | Truck | Bus |
|---|---|---|---|---|---|
| 1990 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| 1991 | 0.96 | 0.96 | 1.13 | 1.02 | 1.00 |
| 1992 | 0.97 | 1.00 | 1.23 | 1.05 | 1.01 |
| 1993 | 0.98 | 1.04 | 1.30 | 1.09 | 1.07 |
| 1994 | 1.00 | 1.07 | 1.33 | 1.16 | 1.12 |
| 1995 | 1.02 | 1.03 | 1.37 | 1.22 | 1.12 |
| 1996 | 1.04 | 1.04 | 1.42 | 1.25 | 1.15 |
| 1997 | 1.07 | 1.05 | 1.48 | 1.31 | 1.19 |
| 1998 | 1.10 | 1.08 | 1.51 | 1.34 | 1.22 |
| 1999 | 1.11 | 1.11 | 1.57 | 1.39 | 1.34 |
| 2000 | 1.14 | 1.10 | 1.61 | 1.41 | 1.33 |
SOURCE: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual issues).