(Short tons, thousands)
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2001 | 48 | 50 | 56 | 51 | 53 | 55 | 50 | 49 | 44 | 49 | 45 | 44 |
| 2002 | 42 | 43 | 54 | 45 | 51 | 50 | 49 | 48 | 47 | 56 | 53 | 45 |
| 2003 | 45 | 46 | 61 | 50 | 49 | 57 | 51 | 49 | 52 | 56 | 52 | 50 |
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, Form 41 Traffic - Segment Data, various years, as of Sept. 16, 2004.