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(Short tons, millions)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2005 | 3.6 | 3.1 | 3.6 | 3.8 | 3.8 | 3.5 | 3.7 | 4.0 | 4.2 | 4.5 | 4.3 | 4.7 |
| 2006 | 4.1 | 3.9 | 5.0 | 4.7 | 5.1 | 5.1 | 5.0 | 5.2 | 5.1 | 4.9 | 4.4 | 4.3 |
| 2007 | 4.5 | 4.6 | 4.9 | 4.8 | 4.9 | 5.5 | 4.7 | 5.2 | 4.0 | 4.8 | 4.7 | 4.7 |
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.