| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1992 | 12763 | 13604 | 14318 | 14582 | 13721 | 13861 | |||||||
| 1993 | 12538 | 14076 | 15178 | 16265 | 16205 | 16876 | 16503 | 16474 | 16171 | 16529 | 16309 | 15901 | 15759 |
| 1994 | 15024 | 15923 | 17446 | 17822 | 17650 | 18252 | 17688 | 18234 | 18006 | 18135 | 17396 | 17010 | 17389 |
| 1995 | 17242 | 18329 | 18843 | 19280 | 19364 | 19884 | 19407 | 19533 | 19048 | 18902 | 18223 | 17774 | 18819 |
| 1996 | 17230 | 18603 | 19683 | 20193 | 20724 | 22340 | 22348 | 22593 | 21349 | 21590 | 19924 | 17694 | 20356 |
| 1997 | 18533 | 19862 | 20298 | 20703 | 20778 | 21100 | 20474 | 20674 | 21056 | 20719 | 19967 | 19489 | 20304 |
| 1998 | 18880 | 20526 | 21397 | 21648 | 21506 | 22042 | 21451 | 21387 | 20988 | 20677 | 19469 | 19667 | 20803 |
| 1999 | 19485 | 20201 | 21606 | 22024 | 21668 | 22135 | 21223 | 21463 | 20892 | 20558 | 19925 | 19740 | 20910 |
| 2000 | 19392 | 21104 | 21702 | 22104 | 21287 | 18543 | 19402 | 19984 | 19602 | 19242 | |||
| 2001 | 18554 | 20074 | 21086 | 20978 | 22658 | ||||||||
| 2002 | |||||||||||||
| 2003 | 17694 | 18140 | 20492 | 21606 | 21886 | 21324 | 21193 | 21201 | 21443 | 19957 | 20493 | ||
| 2004 | 19690 | 21268 | 22736 | 23711 | 22871 | 23617 | 22996 | 22786 | 22496 | 22392 | 21651 | 21594 | 22317 |
| 2005 | 21185 | 23989 | 24005 | 24449 | 23853 | 24819 | 23930 | 24920 | 23897 | 23635 | 23245 | 22722 | 23721 |
| 2006 | 22860 | 25432 | 26576 | 27433 | 27995 | 28400 | 26828 | 27135 | 26191 | 25766 | 24765 | 23028 | 26034 |
| 2007 | 22619 | 24096 | 24861 | 24942 | 25065 | 24888 | 23833 | 24539 | 23138 | 23713 | 22609 | 21443 | 23812 |
| 2008 | 21211 | 22510 | 22879 | 22979 | 23014 | 22123 | 21520 | 21669 | 21694 | 19841 | 20017 | ||
| 2009 | 19699 | 21392 | 21557 | 23133 | 22834 | 23482 | 22439 | 22092 | 22121 |
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