($ millions)
| 2000 | 2005 | 2006 | 2007 | 2008 | |
|---|---|---|---|---|---|
| Truck | 32,770 | 38,056 | 37,526 | 40,370 | 44,390 |
| Rail | 24,645 | 24,137 | 26,247 | 29,151 | 26,581 |
| Pipeline | 2,280 | 5,974 | 6,489 | 7,484 | 10,173 |
| Other and unknown | 8 | 43 | 69 | 72 | 79 |
| TOTAL | 59,704 | 68,212 | 70,330 | 77,078 | 81,223 |
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Transborder Surface Freight Data, 2000-2008.