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(Short tons, thousands)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 9 | 10 | 11 | 11 | 10 | 11 | 10 | 10 | 11 | 11 | 10 | 10 |
| 2007 | 9 | 9 | 10 | 10 | 10 | 11 | 10 | 10 | 10 | 11 | 10 | 10 |
| 2008 | 10 | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 15 | 13 | 10 |
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.