YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,9836,10712,12600,13064,13584,15414,15733,16012,13913,13006,12379,9682,13006
1991,9460,11644,12755,12941,13329,16007,16646,17212,14960,13913,12835,13092,13745
1992,11233,12436,14430,14317,15116,18139,17437,18014,16200,15771,13787,12103,14962
1993,10407,11912,14175,15246,16433,19720,18734,19190,16990,16348,14319,13459,15597
1994,11929,12771,15395,15731,16847,18477,19194,19447,17482,16961,14488,13527,16042
1995,13122,14177,15980,16247,17277,19262,19582,19973,17967,17309,15986,14427,16776
1996,12671,14215,16794,17003,18313,19417,20313, ,18880,18220,16917,14767
1997,13735,14863,17066,16966,17800,,, ,,,19773,16143
1998,14768,16261,18158,18398,19139,21811,21505,21430,20169,19279,17960,16467,18779
1999,15930,16275,19004,18963,20146,22412,22968,23192,20952,20275,19076,17050,19687
2000,15288,17292,19465,19594,20660,22564,23111,23735,20859,19800,18121,16953,19787
2001,15542,17169,19935,19866,21134,22760,22975,23593,21538,20963,19686,16790,20163
2002,16021,18624,20640,20296,22092,23808,23683,24470,21834,21619,19702,18453,20937
2003,16778,17989,19684,19677,21290,23617,23594,24436,21741,21319,19224,17822,20598
2004,,,21203,20999,21748,23558,23970,23986,21679,21250,19613,18544
2005,16281,18411,20741,20569,21115,23309,23888,23488,21457,20490,19502,18021,20606
2006,16685,18635,20676,21320,21987,23978,23930,24210,22678,21925,20871,19188,21340
2007,17869,19469,21948,21804,22751,24307,24460,25197,23012,22585
2008,,,,,21520,22286,22413,23181,20393,19949,19243,16419
2009,15911,17801,19940,20500,21955,23095,24001,23590,22873,20743,19865,17616,20658
2010,16681