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(Short tons, millions)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2005 | 2.2 | 2.5 | 2.3 | 2.3 | 2.2 | 2.5 | 1.8 | 2.0 | 2.3 | 2.3 | 2.5 | 2.4 |
| 2006 | 2.1 | 2.3 | 2.9 | 2.2 | 2.4 | 2.3 | 2.0 | 2.5 | 1.9 | 2.8 | 2.7 | 2.2 |
| 2007 | 2.6 | 2.3 | 3.2 | 2.7 | 2.4 | 2.7 | 3.3 | 3.1 | 2.5 | 2.7 | 3.2 | 3.0 |
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.