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(Short tons, thousands)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 217 | 193 | 276 | 245 | 233 | 252 | 267 | 264 | 277 | 283 | 288 | 267 |
| 2007 | 234 | 215 | 276 | 254 | 254 | 270 | 256 | 260 | 266 | 275 | 273 | 237 |
| 2008 | 223 | 189 | 223 | 228 | 226 | 207 | 216 | 208 | 206 | 211 | 191 | 160 |
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.