(Short tons, millions)
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2002 | 1.0 | 1.2 | 0.9 | 1.0 | 0.9 | 1.2 | 1.0 | 0.8 | 1.3 | 1.1 | 0.8 | 1.3 |
| 2003 | 0.9 | 1.7 | 1.5 | 1.2 | 1.2 | 1.3 | 1.1 | 1.0 | 1.2 | 1.3 | 1.3 | 1.3 |
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, based on data from U.S. Army Corps of Engineers, special tabulation, October 2004.