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(Short tons, thousands)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 25 | 25 | 30 | 26 | 27 | 29 | 26 | 29 | 29 | 30 | 31 | 31 |
| 2007 | 29 | 28 | 34 | 29 | 32 | 34 | 32 | 34 | 34 | 35 | 34 | 32 |
| 2008 | 31 | 32 | 33 | 34 | 33 | 32 | 33 | 32 | 32 | 34 | 30 | 28 |
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Form 41 Traffic-Segment Data, various years, as of July 20, 2009.