| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 4720 | 5100 | 5338 | 5473 | 5549 | 5444 | 5492 | 5631 | 5580 | 5584 | 5122 | 4691 | 5311 | |
| 1991 | 4374 | 5002 | 5250 | 5506 | 5540 | 5563 | 5387 | 5840 | 5790 | 5807 | 5172 | 4909 | 5346 | |
| 1992 | 4942 | 5236 | 5156 | 5090 | 5125 | 5372 | 5760 | 5955 | 6112 | 6022 | 5400 | 5353 | 5476 | |
| 1993 | 4908 | 5383 | 5636 | 6157 | 6237 | 6312 | 6182 | 6700 | 6651 | 6490 | 5906 | 5814 | 6034 | |
| 1994 | 5530 | 5159 | 5527 | 6038 | 6116 | 6189 | 6061 | 6569 | 6569 | 6438 | 5859 | 5768 | 5990 | |
| 1995 | ||||||||||||||
| 1996 | 6926 | 7061 | 6854 | 7335 | 7545 | 7132 | 6773 | 6265 | ||||||
| 1997 | 6126 | 6731 | 7056 | 7369 | 7537 | 7644 | 7384 | 7624 | 8276 | 7261 | 7139 | 6870 | 7251 | |
| 1998 | 6405 | 6948 | 7303 | 7612 | 7568 | 7522 | 7385 | 7800 | 7782 | 7605 | 7233 | 6977 | 7345 | |
| 1999 | 6862 | 7022 | 7605 | 7841 | 7773 | 7702 | 7531 | 7900 | 8033 | 7640 | 7320 | 7086 | 7526 | |
| 2000 | 6867 | 7306 | 7675 | 7957 | 8137 | 7890 | 7576 | 8111 | 8077 | 7730 | 7433 | 7308 | 7672 | |
| 2001 | 6875 | 7330 | 7800 | 8020 | 7941 | 7970 | 7848 | 8377 | 8373 | 8056 | 7770 | 7517 | 7823 | |
| 2002 | 7401 | 7699 | 7801 | 8292 | 8494 | 8218 | 8140 | 8558 | 8480 | 8329 | 7806 | 7478 | 8058 | |
| 2003 | 7405 | 7733 | 7811 | 8164 | 8336 | 8202 | 8056 | 8263 | 8369 | 8166 | 7246 | 7399 | 7929 | |
| 2004 | 6868 | 7525 | 8132 | 8260 | 8104 | 7876 | 7311 | 7978 | 8406 | 8036 | 7664 | 7590 | 7813 | |
| 2005 | 7193 | 7797 | 8096 | 8247 | 8250 | 8329 | 8147 | 8475 | 8429 | 8211 | 7894 | 7607 | 8056 | |
| 2006 | 7660 | 8205 | 8567 | 8735 | 8993 | 8998 | 8580 | 9027 | 9071 | 8976 | 8625 | 8115 | 8629 | |
| 2007 | 7922 | 8309 | 8808 | 8838 | 8970 | 8958 | 8502 | 8928 | 8693 | 8604 | 8122 | 7667 | 8527 | |
| 2008 | 7168 | 7722 | 8029 | 8395 | 9014 | 8208 | 7760 |
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