(Short tons, thousands)
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2001 | 18 | 18 | 21 | 17 | 19 | 20 | 19 | 20 | 17 | 19 | 19 | 18 |
| 2002 | 18 | 18 | 22 | 21 | 21 | 20 | 20 | 21 | 20 | 23 | 21 | 19 |
| 2003 | 20 | 20 | 22 | 21 | 21 | 20 | 21 | 20 | 21 | 23 | 23 | 21 |
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, Form 41 Traffic - Segment Data, various years, as of Sept. 16, 2004.