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(Short tons, thousands)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 67 | 67 | 77 | 74 | 76 | 81 | 83 | 75 | 85 | 85 | 84 | 87 |
| 2007 | 78 | 76 | 88 | 79 | 80 | 81 | 80 | 77 | 80 | 85 | 85 | 84 |
| 2008 | 81 | 81 | 84 | 82 | 77 | 77 | 76 | 74 | 71 | 73 | 71 | 61 |
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, Form 41 Traffic-Segment Data, various years, as of July 20, 2009.