(Short tons, thousands)
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2001 | 10 | 11 | 12 | 10 | 10 | 10 | 10 | 11 | 10 | 9 | 8 | 8 |
| 2002 | 6 | 8 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 8 |
| 2003 | 8 | 8 | 9 | 8 | 8 | 10 | 9 | 8 | 8 | 9 | 11 | 10 |
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, Form 41 Traffic - Segment Data, various years, as of Sept. 16, 2004.