($ millions)
| 2000 | 2005 | 2006 | 2007 | 2008 | |
|---|---|---|---|---|---|
| Truck | 36,008 | 39,524 | 42,237 | 43,479 | 42,199 |
| Rail | 1,433 | 3,039 | 3,946 | 5,156 | 5,260 |
| Pipeline | 206 | 369 | 516 | 322 | 447 |
| Other and unknown | 1,729 | 43 | 24 | 96 | 268 |
| TOTAL | 39,376 | 42,974 | 46,724 | 49,054 | 48,174 |
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Transborder Surface Freight Data, 2000-2008.