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(Short tons, millions)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2005 | 6.3 | 4.6 | 5.8 | 5.5 | 4.7 | 4.6 | 4.4 | 3.2 | 2.4 | 4.8 | 4.9 | 5.5 |
| 2006 | 6.2 | 6.4 | 7.1 | 6.1 | 5.9 | 5.9 | 6.1 | 6.1 | 5.9 | 7.6 | 5.5 | 5.8 |
| 2007 | 7.0 | 6.5 | 6.5 | 5.8 | 6.0 | 4.7 | 6.4 | 7.2 | 5.9 | 7.0 | 6.8 | 7.8 |
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.