| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1992 | 1934 | 2173 | 2310 | 2487 | 2468 | 1933 | 1613 | 1859 | 1777 | 1583 | |||
| 1993 | 1493 | 1732 | 1984 | 2420 | 2597 | 2840 | 2941 | 2304 | 1911 | 2197 | 2098 | 2803 | 2281 |
| 1994 | 2607 | 2786 | 3156 | 3417 | 3569 | 3762 | 3444 | 3667 | 3081 | 3343 | 2960 | 2836 | 3222 |
| 1995 | 2921 | 3120 | 3470 | 3827 | 3987 | 4174 | 4019 | 4422 | 4912 | 4936 | 4589 | 4289 | 4056 |
| 1996 | 4210 | 4328 | 4769 | 5649 | 5896 | 5757 | 5936 | 6861 | 6779 | 6423 | 5886 | 4492 | 5582 |
| 1997 | 4100 | 4509 | 4908 | 5793 | 5015 | 5472 | 5281 | 5408 | 5822 | 5598 | 5393 | 5421 | 5227 |
| 1998 | 6082 | 7234 | 7483 | 8105 | 8342 | 8255 | 6783 | 6814 | 6694 | 6252 | 5038 | 4800 | 6824 |
| 1999 | 4756 | 4687 | 5134 | 5913 | 5843 | 5815 | 5495 | 5408 | 5574 | 5516 | 5043 | 4499 | 5307 |
| 2000 | 4427 | 4372 | 5019 | 5977 | 6021 | 5884 | 5298 | 5485 | 5626 | 5462 | 4957 | 4784 | 5276 |
| 2001 | 4352 | 4869 | 5321 | 4095 | 5896 | 5969 | 5528 | 5880 | 5875 | 5802 | 5512 | 4662 | 5313 |
| 2002 | 4727 | 5214 | 5595 | 6696 | 3623 | 6095 | 5887 | 5956 | 6250 | 6343 | 5539 | 5340 | 5605 |
| 2003 | 5720 | 6126 | 5699 | 5808 | 591 | 4806 | 5378 | 5773 | 7348 | 7525 | 7032 | 6092 | 5658 |
| 2004 | 5403 | 6087 | 6979 | 7695 | 7489 | 7306 | 6729 | 7233 | 7245 | 6981 | 6603 | 6479 | 6852 |
| 2005 | 6326 | 6989 | 7586 | 8221 | 8180 | 8285 | 7716 | 8224 | 8110 | 7980 | 7321 | 6777 | 7643 |
| 2006 | 7084 | 7762 | 8104 | 8803 | 9129 | 8800 | 8127 | 8738 | 8535 | 7959 | 7478 | 6901 | 8118 |
| 2007 | 6987 | 7452 | 8028 | 8754 | 9125 | 9157 | 8441 | 8390 | 8325 | 8459 | 7473 | 6762 | 8113 |
| 2008 | 5555 | 6149 | 6710 |
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