(Short tons, thousands)
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2001 | 24 | 24 | 29 | 25 | 27 | 27 | 24 | 24 | 20 | 26 | 23 | 20 |
| 2002 | 18 | 19 | 26 | 24 | 28 | 27 | 26 | 25 | 24 | 32 | 28 | 22 |
| 2003 | 20 | 22 | 26 | 22 | 24 | 27 | 25 | 24 | 24 | 26 | 24 | 22 |
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, Form 41 Traffic - Segment Data, various years, as of Sept. 16, 2004.