| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 20242 | 19595 | 18878 | 16863 | 17779 | 17992 | |||||||
| 2007 | 16646 | 18206 | 20419 | 20588 | 20602 | 21849 | 22635 | 22320 | 21112 | 19339 | 20188 | 17422 | 20111 |
| 2008 | 16862 | 17154 | 19410 | 20470 | 20653 | 21358 | 22963 | 22456 | 21589 | 20248 | 19118 | 16896 | 19931 |
| 2009 | 17011 | 17560 | 21735 | 22933 | 25222 | 23697 | 23864 |
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