| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1998 | 3480 | 3617 | 4004 | 3356 | 2944 | ||||||||
| 1999 | 2913 | 2940 | 3207 | 3412 | 3487 | 3671 | 3496 | 3654 | 3746 | 4175 | 3774 | 3307 | 3482 |
| 2000 | 2972 | 3200 | 3468 | 3693 | 3758 | 3909 | 3692 | 3901 | 3835 | 4034 | 3731 | 3305 | 3625 |
| 2001 | 3036 | 3051 | 3396 | 3550 | 3678 | 3820 | 3706 | 3763 | 3864 | 4171 | 3869 | 3293 | 3600 |
| 2002 | 3063 | 3229 | 3509 | 3771 | 3901 | 3933 | 3824 | 3984 | 3917 | 4292 | 3956 | 3505 | 3740 |
| 2003 | 3290 | 3474 | 3474 | 3742 | 3950 | 4066 | 3953 | 3945 | 4076 | 4300 | 3661 | 3425 | 3780 |
| 2004 | 3114 | 3301 | 3638 | 3839 | 3761 | 3844 | 3758 | 3846 | 3929 | 4107 | 3915 | 3665 | 3726 |
| 2005 | 3138 | 3463 | 3646 | 3735 | 3746 | 3998 | 3871 | 3956 | 3932 | 3825 | 3352 | 3068 | 3644 |
| 2006 | 3199 | 3474 | 3581 | 3775 | 3959 | 4111 | 3930 | 4102 | 4165 | 3989 | 3591 | 3302 | 3765 |
| 2007 | 3323 | 3549 | 3725 | 3795 | 3929 | 4057 | 4192 | 4002 | 4124 | 4099 | 3581 | 3176 | 3796 |
| 2008 | 2953 | 3202 | 3477 |
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