| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 2849 | 2869 | 3440 | 3821 | 4124 | 4472 | 5067 | 5070 | 4509 | 3903 | 3530 | 3018 | 3896 |
| 1991 | 2881 | 3388 | 3522 | 3996 | 4375 | 4641 | 5213 | 5216 | 4590 | 4368 | 3786 | 3562 | 4133 |
| 1992 | 3422 | 3720 | 4198 | 4474 | 5011 | 5166 | 5564 | 5598 | 4997 | 4589 | 3941 | 3384 | 4520 |
| 1993 | 3221 | 3674 | 3997 | 4511 | 5195 | 5429 | 5779 | 6048 | 5667 | 5286 | 4196 | 4040 | 4760 |
| 1994 | 4016 | 4073 | 4674 | 5212 | 5667 | 5921 | 6326 | 6300 | 5979 | 5469 | 4521 | 4320 | 5214 |
| 1995 | 4524 | 4690 | 4948 | 5475 | 6126 | 6808 | 6736 | 6429 | 5650 | 5067 | 4755 | ||
| 1996 | 4182 | 4574 | 4930 | 5521 | 5783 | 6356 | 6777 | 6617 | 5962 | 5544 | 4682 | 4217 | 5429 |
| 1997 | 4418 | 4768 | 4861 | 5352 | 5992 | 6617 | 7176 | 7191 | 6466 | 6005 | 5467 | 4903 | 5768 |
| 1998 | 4613 | 5096 | 5597 | 6027 | 6426 | 6659 | 7212 | 7049 | 5854 | 5422 | 4954 | ||
| 1999 | 4869 | 5186 | 5613 | 6107 | 6458 | 6709 | 6783 | 7339 | 6799 | 6466 | 5849 | 5441 | 6135 |
| 2000 | 4915 | 5443 | 5864 | 6405 | 7000 | 7422 | 7696 | 7740 | 6849 | 6451 | 5644 | 5197 | 6386 |
| 2001 | 5150 | 5384 | 5828 | 6065 | 6602 | 6849 | 7306 | 7487 | 6765 | 6382 | 5726 | 5077 | 6218 |
| 2002 | 5101 | 5367 | 5448 | 6170 | 6680 | 6766 | 7174 | 7464 | 6828 | 6585 | 5922 | 5611 | 6260 |
| 2003 | 5440 | 5874 | 5712 | 6002 | 6438 | 7124 | 8029 | 7588 | 7009 | 6768 | 5655 | 5557 | 6433 |
| 2004 | 5155 | 5719 | 6184 | 6701 | 6749 | 7393 | 8037 | 7828 | 7181 | 6774 | 6141 | 5812 | 6640 |
| 2005 | 5386 | 6080 | 6286 | 6523 | 7036 | 7484 | 8093 | 8156 | 7246 | 6900 | 6300 | 5762 | 6771 |
| 2006 | 5765 | 6026 | 6339 | 6627 | 7098 | 7493 | 7823 | 8007 | 7347 | 6962 | 6145 | 5815 | 6787 |
| 2007 | 5618 | 5948 | 6470 | 6793 | 7188 | 7649 | 8125 | 8514 | 7581 | 7243 | 6527 | 5745 | 6950 |
| 2008 | 5163 | 5742 | 6051 |
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