($ millions)
| 2000 | 2005 | 2006 | 2007 | 2008 | |
|---|---|---|---|---|---|
| Truck | 85,468 | 108,788 | 115,108 | 114,411 | 101,188 |
| Rail | 8,598 | 20,975 | 21,486 | 21,427 | 17,957 |
| Pipeline | 78 | 166 | 319 | 369 | 413 |
| Other and unknown | 297 | 544 | 312 | 392 | 610 |
| TOTAL | 94,441 | 130,473 | 137,226 | 136,600 | 120,168 |
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Transborder Surface Freight Data, 2000-2008.