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(Short tons, thousands)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 133 | 122 | 140 | 136 | 132 | 129 | 123 | 150 | 162 | 154 | 150 | 151 |
| 2007 | 141 | 138 | 156 | 161 | 146 | 132 | 135 | 133 | 150 | 155 | 145 | 150 |
| 2008 | 136 | 143 | 148 | 167 | 136 | 126 | 128 | 130 | 137 | 145 | 135 | 122 |
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.