| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2004 | 21871 | 23850 | 25042 | 24525 | 22748 | 21423 | 19968 | 19899 | |||||
| 2005 | 16081 | 19016 | 19986 | 20964 | 22078 | 23794 | 25387 | 27558 | 25254 | 21053 | 20274 | 17066 | 21543 |
| 2006 | 17714 | 18838 | 19852 | 20965 | 23023 | 24081 | 24656 | 24697 | 22673 | 21594 | 19563 | 18985 | 21387 |
| 2007 | 16934 | 18719 | 20315 | 20783 | 22535 | 26360 | 24468 | 24798 | 22272 | 21328 | 19740 | 16813 | 21255 |
| 2008 | 15606 | 17667 | 19066 | 21189 | 21916 | 23361 | 23204 | 21453 | 20608 | 18672 | 17931 | ||
| 2009 | 15777 | 17430 | 17933 | 19775 | 20708 | 21509 | 22813 | 20052 |
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