YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1991,,,,,,,,,,,,22595
1992,19953,21453,22383,23595,24224,26642,27779,28300,24621,23327,22443,23328,24080
1993,20296,22531,23891,25584,25691,27517,29702,29664,26487,25031,23778,25352,25480
1994,22503,23262,24953,26673,27964,30205,32444,34743,31095,28585,24725,25932,27789
1995,22771,23655,25479,26722,28052,28635,29229,30110,28799,27153,,25440
1996,21508,24279,25735,25980,27263,28733,29347,29969,27159,26155,23761,25315,26267
1997,23560,24852,25230,26982,28179,28889,29679,30346,27075,26405,25808,26766,26981
1998,23658,25815,26908,27682,29711,30636
1999,25299,26173,27549,28527,29782,31216,31900,32711,29705,28926,27581,28365,28978
2000,25206,27034,27895,28833,29814,30633,31367,32319,30563,33917,30545,28303,29702
2001,25908,27564,30890,33357,33094,31595,33789,34873,31677,30445,28313,28271,30815
2002,25949,27411,27620,29917,31619,31493,33551,34379,29733,29160,28152,28592,29798
2003,26346,27980,27891,29467,31038,33163,34863,36299,31770,31158,28624,31104,30809
2004,27575,30014,31440,35419,36101,35191,35809,35645,32683,31455,30663,31885,32823
2005,28027,30168,33297,36265,37503,38442,38453,38045,33944,33015,31690,32669,34293
2006,29987,31919,33223,33636,34371,36420,36926,38012,32145,30563,28967,29734,32992
2007,27134,29105,30615,30827,33073,33858,34008,34777,30427,29717,28451,28169,30847
2008,25845,29018,28988,29390,30580,31108,32887