| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 3453 | 3797 | 4596 | 5024 | 5306 | 6094 | 6584 | 6872 | 5392 | 4549 | 4625 | 5037 | |
| 1991 | 3643 | 4380 | 5039 | 5048 | 5313 | 6392 | 6903 | 6962 | 5737 | 5160 | 4850 | 4901 | 5367 |
| 1992 | 4276 | 4752 | 5300 | 5901 | 5938 | 6856 | 7916 | 7940 | 5969 | 5594 | 5119 | 4727 | 5878 |
| 1993 | 4080 | 4728 | 5624 | 6168 | 6208 | 7227 | 8880 | 8670 | 6713 | 5861 | 5218 | 5031 | 6211 |
| 1994 | 4872 | 5103 | 5996 | 6439 | 6791 | 7567 | 9079 | 8539 | 6977 | 6017 | 5239 | 5687 | 6537 |
| 1995 | 5021 | 5572 | 6220 | 6462 | 6795 | 7946 | 9079 | 9054 | 7471 | 6414 | 6331 | 6073 | 6870 |
| 1996 | 4982 | 5693 | 6517 | 6952 | 7122 | 8229 | 9429 | 9573 | 7523 | 6597 | 6280 | 6079 | 7081 |
| 1997 | 5375 | 5985 | 6977 | 6728 | 6830 | 8480 | 9827 | 9845 | 7681 | 7043 | 6855 | 6546 | 7348 |
| 1998 | 5739 | 6228 | 6845 | 7552 | 8154 | 9059 | 11140 | 10339 | 8261 | 7421 | 7152 | 6678 | 7881 |
| 1999 | 6087 | 6535 | 7675 | 7819 | 8215 | 9697 | 11077 | 10903 | 8676 | 7700 | 7617 | 6978 | 8248 |
| 2000 | 6232 | 6928 | 7665 | 7919 | 8391 | 9498 | 11045 | 10623 | 8281 | 7753 | 7305 | 7037 | 8223 |
| 2001 | 6361 | 6783 | 7822 | 8104 | 7930 | 9818 | 10687 | ||||||
| 2002 | 10947 | 8737 | 8128 | 7508 | 8271 | ||||||||
| 2003 | 6905 | 7081 | 7951 | 8387 | 9329 | 10162 | 11548 | 11184 | 8668 | 8283 | 7776 | 7312 | 8716 |
| 2004 | 6614 | 6817 | 8247 | 8966 | 9587 | 11582 | 11146 | 9259 | 8618 | 8142 | 7728 | ||
| 2005 | 6469 | 7197 | 8408 | 8515 | 9165 | 10251 | 11717 | 11317 | 8871 | 8834 | 7959 | 7587 | 8858 |
| 2006 | 6766 | 7703 | 8410 | 8735 | 9037 | 10408 | 11733 | 10898 | 9564 | 8581 | 8317 | 8055 | 9017 |
| 2007 | 7059 | 7657 | 8867 | 9110 | 9369 | 10694 | 11937 | 11533 | 9624 | 8708 | 8779 | 7590 | 9244 |
| 2008 | 6893 | 7409 | 8739 |
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