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(Short tons, thousands)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 47 | 49 | 62 | 54 | 55 | 58 | 59 | 60 | 61 | 63 | 56 | 57 |
| 2007 | 52 | 51 | 59 | 56 | 60 | 64 | 62 | 61 | 62 | 64 | 63 | 63 |
| 2008 | 60 | 60 | 69 | 71 | 74 | 73 | 71 | 66 | 63 | 63 | 54 | 47 |
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.