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(Short tons, thousands)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 46 | 49 | 57 | 53 | 53 | 53 | 53 | 51 | 58 | 59 | 60 | 54 |
| 2007 | 48 | 53 | 62 | 56 | 55 | 58 | 58 | 54 | 59 | 62 | 58 | 56 |
| 2008 | 51 | 56 | 61 | 55 | 56 | 57 | 54 | 51 | 48 | 53 | 48 | 36 |
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.