YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,11450,12294,13144,13256,15335,16119,13587,13710,12568,13066,12470,11350,13199
1991,11627,12548,13073,13682,13712,13703,12748,12875,12501,15091,14403,13126,13260
1992,12898,13819,17200,17618,17651,17887,16668,15323,14857,14981,14193,13935,15632
1993,11437,13049,16247,16655,16655,16126,16212,15132,15444,15700,15812,15698,15359
1994,13883,14727,16139,16315,16554,17127,16486,16558,16425,16287,15585,15040,15932
1995,15287,16182,16760,17274,17262,17538,16602,17262,18569,17539,16928,16068,16939
1996,,,,,,,,,15607,15015,16405,16543
1997,16614,17524,18597,19241,19888,20448,19110,18940,18474,18056,18093,17849,18570
1998,17024,18664,19147,19528,19307,20006,19683,19642,19665,19637,19590,16721,19051
1999,18962,19097,20387,20970,21147,21368,20783,21310,21102,21514,20314,19547,20542
2000,19031,20402,20943,21924,21913,21743,21624,23652,22026,21788,20739,20231,21335
2001,23310,20675,22806,22526,22452,22070,22315,21983,21071,21119,20253,19405,21665
2002,23832,26466,27135,28502,28559,27851,27463,28208,27656,28218,26951,25953,27233
2003,24187,20938,20810,21714,22008,22668,21282,21534,21183,21381,20230,20299,21520
2004,19145,20665,21951,22910,23658,22097,21846,22862,22928,21420,21533,21679,21891
2005,20826,25751,23850,22875,23023,23258,25180,27395,22673,22795,22499,22208,23528
2006,21919,23989,28555,31657,32256,31786,30102,28091,26869,26608,25773,21856,27455
2007,19206,20710,21128,21129,20638,19992,,21180,20465,20928,20043,19053
2008,17863,19916,20074,20979,20625,19509,19413,19596,,18739,18217,18077
2009,17494,19083,19031,19460,20734,19856,19078,18940,19261