| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 2977 | 3097 | 3748 | 4027 | 4518 | 5465 | 5794 | 5850 | 4669 | 4204 | 3834 | 3078 | 4279 |
| 1991 | 2867 | 3201 | 3920 | 3975 | 4423 | 5419 | 5871 | 6249 | 4783 | 4304 | 3733 | 3632 | 4373 |
| 1992 | 3183 | 3412 | 4135 | 4272 | 4691 | 5672 | 6087 | 6227 | 5076 | 4714 | 4043 | 3486 | 4600 |
| 1993 | 2523 | 3081 | 4029 | 4472 | 4641 | 5650 | 6331 | 6531 | 5311 | 4713 | 4209 | 4054 | 4638 |
| 1994 | 3450 | 3640 | 4461 | 4730 | 5158 | 6262 | 6821 | 6683 | 5552 | 5086 | 4195 | 3978 | 5011 |
| 1995 | 3579 | 3920 | 4593 | 4740 | 5231 | 6343 | 6811 | 6850 | 5811 | 5126 | 4980 | 4319 | 5192 |
| 1996 | 3491 | 3828 | 4848 | 5001 | 5392 | 6429 | 7015 | 7136 | 5819 | 5124 | 4743 | 4264 | 5258 |
| 1997 | 3850 | 4185 | 5058 | 5111 | 5625 | 6650 | 7377 | 7441 | 6005 | 5567 | 5150 | 4678 | 5558 |
| 1998 | 4133 | 4353 | 5154 | 5445 | 5864 | 6992 | 7641 | 7690 | 6230 | 5776 | 5395 | 4770 | 5787 |
| 1999 | 4407 | 4593 | 5611 | 5692 | 6272 | 7352 | 7941 | 7983 | 6670 | 6103 | 5882 | 5137 | 6137 |
| 2000 | 4496 | 4764 | 5704 | 5910 | 6174 | 7219 | 7797 | 8102 | 6505 | 6100 | 5376 | 4776 | 6077 |
| 2001 | 4411 | 4828 | 5869 | 6017 | 6394 | 7365 | 7880 | 8169 | 6929 | 6180 | 5753 | 4969 | 6230 |
| 2002 | 4462 | 4715 | 6135 | 6146 | 8034 | 8271 | 8424 | 6708 | 6431 | 5923 | 5680 | ||
| 2003 | 4972 | 5067 | 6003 | 6205 | 6478 | 8441 | 8598 | 6853 | 6613 | 6035 | 5507 | ||
| 2004 | 4552 | 4962 | 6292 | 6607 | 6795 | 7684 | 8367 | 8252 | 7029 | 6614 | 6175 | 5576 | 6575 |
| 2005 | 4805 | 5361 | 6866 | 6553 | 6836 | 7944 | 8765 | 8372 | 6996 | 6590 | 6491 | 5849 | 6786 |
| 2006 | 5252 | 5615 | 6631 | 6907 | 7146 | 8244 | 8252 | 8333 | 7497 | 7071 | 6798 | 6102 | 6987 |
| 2007 | 5364 | 5711 | 6909 | 6977 | 6958 | 8043 | 8408 | 8368 | 7082 | 6716 | 6967 | 5793 | 6941 |
| 2008 | 4917 | 5017 | 6640 | 6567 | 7032 | 7621 | 8236 | 8167 | 6776 | 6543 | 6487 | 4985 | 6582 |
| 2009 | 5114 | 5437 | 6486 | 6577 | 7214 | 8029 | 8878 | 8514 | 7291 |
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