Excel | CSV | Graphic Version
| Overall | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Activity | 1.00 | 1.01 | 1.05 | 1.06 | 1.10 | 1.11 | 1.14 | 1.16 | 1.18 | 1.20 | 1.22 |
| Energy | 1.00 | 0.98 | 1.01 | 1.03 | 1.06 | 1.09 | 1.11 | 1.13 | 1.16 | 1.21 | 1.21 |
| Efficiency | 1.00 | 1.04 | 1.04 | 1.03 | 1.04 | 1.02 | 1.02 | 1.02 | 1.02 | 1.00 | 1.01 |
Source: Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2002, tables 1-34, 1-44, 4-6.