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(Short tons, thousands)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2005 | 4.5 | 5.0 | 5.1 | 5.6 | 5.7 | 5.8 | 6.0 | 4.9 | 5.6 | 4.5 | 5.6 | 5.0 |
| 2006 | 6.9 | 5.3 | 5.8 | 6.1 | 6.0 | 5.7 | 6.3 | 6.6 | 5.6 | 6.3 | 5.5 | 5.3 |
| 2007 | 5.8 | 5.0 | 5.4 | 6.1 | 6.2 | 6.4 | 6.6 | 6.4 | 6.4 | 5.1 | 5.6 | 5.6 |
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.