| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 2662 | 2890 | 3345 | 3639 | 3914 | 4402 | 4062 | 4032 | 3934 | 4168 | 3390 | 2914 | 3616 |
| 1991 | 2685 | 3055 | 3404 | 3598 | 3993 | 4564 | 4721 | 4659 | 4266 | 4458 | 3845 | 3275 | 3882 |
| 1992 | 3087 | 3411 | 3740 | 3882 | 4035 | 4227 | |||||||
| 1993 | 4610 | 4724 | 4583 | 4778 | 4034 | 3660 | |||||||
| 1994 | 3515 | 3848 | 4156 | 4143 | 4551 | 4452 | 4725 | 4738 | 4676 | 4929 | 4161 | 4103 | 4337 |
| 1995 | 3826 | 4158 | 4382 | 4669 | 4920 | 5377 | 5189 | 5281 | 5188 | 5317 | 4516 | 4092 | 4743 |
| 1996 | 3719 | 4079 | 4580 | 4868 | 5185 | 5743 | 5384 | 5526 | 5327 | 5553 | 4741 | 4379 | 4924 |
| 1997 | 2596 | 4486 | 4734 | 4909 | 5191 | 5585 | 5750 | 5671 | 5329 | 5490 | 4749 | 4503 | 4916 |
| 1998 | 4038 | 4587 | 4852 | 5186 | 5204 | 5891 | 5690 | 5734 | 5664 | 5972 | 5150 | 4639 | 5217 |
| 1999 | 4506 | 4693 | 5170 | 5309 | 5600 | 6194 | 5933 | 5944 | 5985 | 5965 | 5232 | 4686 | 5435 |
| 2000 | 4288 | 4756 | 5031 | 5348 | 5590 | 6406 | 5750 | 5449 | 5627 | 5830 | 4873 | 4581 | 5294 |
| 2001 | 4219 | 4599 | 5016 | 5392 | 5850 | 6124 | 5857 | 5861 | 5907 | 6071 | 5358 | 4708 | 5414 |
| 2002 | 4594 | 4971 | 5161 | 5647 | 6118 | 6562 | 6016 | 6161 | 6104 | 6348 | 5436 | 4992 | 5676 |
| 2003 | 4747 | 5161 | 5345 | 5616 | 6147 | 6652 | 6115 | 6099 | 6186 | 6409 | 5448 | 5171 | 5758 |
| 2004 | 4710 | 5188 | 5698 | 6040 | 6191 | 6828 | 6424 | 6267 | 6301 | 6416 | 5493 | 5305 | 5905 |
| 2005 | 4815 | 5380 | 5741 | 5896 | 6238 | 6806 | 6452 | 6318 | 6057 | 6161 | 5484 | 5159 | 5876 |
| 2006 | 4940 | 5394 | 5596 | 5947 | 6263 | 6914 | 6396 | 6504 | 6459 | 6479 | 5718 | 5284 | 5991 |
| 2007 | 5065 | 5391 | 5894 | 6133 | 6438 | 6691 | 6305 | 6439 | 6625 | 6491 | 5651 | 4994 | 6010 |
| 2008 | 4729 | 5128 | 5364 |
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