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(Short tons, millions)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2005 | 6.9 | 6.8 | 7.0 | 6.2 | 7.5 | 7.3 | 7.7 | 7.3 | 7.5 | 8.3 | 8.5 | 8.4 |
| 2006 | 9.1 | 7.3 | 7.4 | 7.9 | 8.8 | 7.2 | 8.3 | 8.4 | 7.3 | 7.3 | 6.7 | 7.8 |
| 2007 | 7.8 | 6.3 | 8.5 | 6.7 | 7.8 | 8.7 | 8.9 | 8.6 | 6.9 | 7.6 | 7.6 | 7.4 |
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, based on data from U.S. Army Corps of Engineers, special tabulation, July 20, 2009.