| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 2441 | 2143 | 3214 | 3973 | 4812 | 6341 | 7521 | 7611 | 5680 | 4112 | 3297 | 2328 | 4471 |
| 1991 | 2147 | 2790 | 3481 | 3934 | 4652 | 6428 | 7639 | 8056 | 5915 | 4442 | 3189 | 3223 | 4671 |
| 1992 | 2710 | 3167 | 3943 | 4420 | 5295 | 6789 | 8201 | 8169 | 6134 | 4733 | 3694 | 2905 | 5035 |
| 1993 | 2643 | 2972 | 3728 | 4175 | 5428 | 6433 | 7817 | 8574 | 6298 | 5055 | 3612 | 3768 | 5058 |
| 1994 | 3150 | 3106 | 4298 | 4970 | 6235 | 7418 | 9225 | 8705 | 6572 | 5319 | 3873 | 3460 | 5546 |
| 1995 | 3241 | 3441 | 5971 | 7360 | 8848 | 8971 | 6954 | 5152 | 4122 | 3996 | |||
| 1996 | 2791 | 3176 | 4209 | 4767 | 5265 | 8940 | 6517 | 5419 | 3674 | ||||
| 1997 | 2719 | 3452 | 4302 | 4775 | 5920 | 7382 | 8991 | 9519 | 6818 | 5347 | 4590 | 3991 | 5651 |
| 1998 | 3140 | 3778 | 4728 | 5284 | 5777 | 8319 | 9388 | 9454 | 7348 | 5672 | 4279 | ||
| 1999 | 3181 | 3575 | 4681 | 5219 | 6329 | 7817 | 8941 | 10129 | 6404 | 5716 | 4955 | 4031 | 5915 |
| 2000 | 3281 | 3965 | 5222 | 5477 | 6374 | 8066 | 9737 | 9497 | 7041 | 5713 | 4623 | 3842 | 6070 |
| 2001 | 3522 | 3634 | 4808 | 5385 | 6456 | 7791 | 9379 | 9660 | 7424 | 5800 | 5054 | 4010 | 6077 |
| 2002 | 3600 | 3993 | 4562 | 5310 | 9557 | 9702 | 10158 | 7647 | 6095 | 4997 | 4682 | ||
| 2003 | 3876 | 4184 | 4814 | 5521 | 6607 | 8301 | 9693 | 10235 | 7946 | 6128 | 4849 | 4282 | 6370 |
| 2004 | 3632 | 4348 | 5183 | 5992 | 6602 | 7923 | 9542 | 9606 | 7453 | 6102 | 5292 | 4691 | 6364 |
| 2005 | 3745 | 4549 | 5331 | 5697 | 6644 | 8212 | 10028 | 9581 | 7283 | 5864 | 5276 | 4492 | 6392 |
| 2006 | 4218 | 4428 | 5311 | 5982 | 6614 | 8214 | 9691 | 9457 | 7622 | 6267 | 5344 | 4892 | 6503 |
| 2007 | 4193 | 4567 | 5542 | 6069 | 6832 | 8361 | 9978 | 9947 | 7842 | 6269 | 5491 | 4787 | 6657 |
| 2008 | 3950 | 4085 | 5487 | 5415 | 6612 | 7763 | 9014 | 9205 | 6922 | 5856 | 5094 | 3805 | 6101 |
| 2009 | 3817 | 4497 | 4924 | 5478 | 6719 | 8073 | 9936 | 9728 | 7675 |
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