| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1998 | 6375 | 6920 | 7004 | 7557 | 7169 | 6341 | 7185 | 8033 | 7336 | 6653 | 6429 | ||
| 1999 | 6435 | 6541 | 7599 | 8099 | 8337 | 8134 | 8188 | 8195 | 7760 | 7087 | |||
| 2000 | 7070 | 8307 | |||||||||||
| 2001 | 8550 | 7277 | |||||||||||
| 2002 | |||||||||||||
| 2003 | 7727 | 8212 | 8518 | 6700 | 6644 | 6454 | 5554 | 5535 | |||||
| 2004 | 5440 | 5839 | 6425 | 6694 | 6613 | 6648 | 6683 | 6278 | 5961 | 5798 | |||
| 2005 | |||||||||||||
| 2006 | |||||||||||||
| 2007 | |||||||||||||
| 2008 |
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