| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 3913 | 5601 | 5082 | 5060 | 5272 | 5423 | 5260 | 5418 | 5054 | 5091 | 4960 | 4662 | 5061 |
| 1991 | 4607 | 4929 | 5198 | 5440 | 5414 | 5522 | 5421 | 5615 | 5222 | 5742 | 5607 | 5461 | 5350 |
| 1992 | 5358 | 5902 | 6178 | 6378 | 6312 | 6574 | 6488 | 6263 | 6300 | 6186 | 5896 | 5524 | 6129 |
| 1993 | 4818 | 5607 | 5965 | 6467 | 6479 | 6463 | 6372 | 6364 | 6298 | 6458 | 6193 | 6343 | 6154 |
| 1994 | 5962 | 6230 | 6716 | 6936 | 7249 | 7231 | 7058 | 7332 | 7058 | 7318 | 6728 | 6891 | 6897 |
| 1995 | 6347 | 6596 | 6850 | 6872 | 7173 | 6992 | 7235 | 6469 | 7472 | 6755 | 6440 | ||
| 1996 | 6291 | 6818 | 6921 | 6663 | 7519 | 8091 | 7765 | 7978 | 8495 | 8017 | 7736 | 6917 | 7434 |
| 1997 | 6920 | 7389 | 7812 | 8227 | 8375 | 8404 | 7820 | 7667 | 7516 | 7976 | 7280 | 7110 | 7708 |
| 1998 | 6801 | 7384 | 7676 | 8036 | 7904 | 8177 | 7956 | 8214 | 8052 | 7983 | 7478 | 7561 | 7769 |
| 1999 | 7367 | 7427 | 7930 | 8469 | 8566 | 8829 | 8453 | 8656 | 8575 | 8491 | 8078 | 7811 | 8221 |
| 2000 | 7712 | 8369 | 8216 | 8824 | 9163 | 9139 | 9189 | 9951 | 10183 | 9394 | 8629 | 8418 | 8932 |
| 2001 | 7950 | 8390 | 9118 | 9653 | 9841 | 8994 | 9886 | 9623 | 9318 | 9092 | 8778 | 8306 | 9079 |
| 2002 | 8694 | 9177 | 9687 | 10338 | 10386 | 10271 | 11535 | 12945 | 11906 | ||||
| 2003 | |||||||||||||
| 2004 | |||||||||||||
| 2005 | |||||||||||||
| 2006 | |||||||||||||
| 2007 |
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