Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,9468,9937,10655,11608,11757,13809,13363,12711,11393,10888,10186,9170,11251,
1991,9169,10211,10507,11355,11772,12905,13014,11539,10464,10521,9843,8859,10849,
1992,8859,9636,10906,12001,12855,13937,13666,13084,12239,11967,10542,10738,11741,
1993,10030,10721,11652,13085,14439,14760,14668,14599,13694,13023,11540,11801,12847,
1994,11253,11647,13170,13785,14410,15882,15569,14838,13576,13170,11356,11527,13359,
1995,11491,12179,12566,13881,14418,15289,16025,15604,13959,13391,12138,11808,13562,
1996,11384,12153,12897,14335,14899,16121,16038,15724,14829,13534,12598,11644,13846,
1997,11253,12261,12657,13708,13544,15090,14988,14927,13829,13232,12287,12028,13317,
1998,11536,12325,12465,14370,14283,15427,15706,14835,13739,13041,11814,11886,13452,
1999,11595,11905,12785,14053,14611,15316,15516,15078,14190,13436,12366,12405,13605,
2000,11798,12682,13268,14477,14421,15809,15761,15403,14304,13712,12238,12981,13905,
2001,12016,12778,13647,14948,15460,16148,15993,15953,15204,14343,13449,13046,14415,
2002,12248,12902,13380,15484,15639,16425,16241,15921,15041,14508,13571,13295,14555,
2003,12948,13344,13439,14704,15282,15767,15378,14715,15123,14178,12710,13174,14230,
2004,11824,12584,13853,14972,14791,15410,15497,15088,14455,13752,12914,13258,14033,
2005,12243,13116,13343,14298,14561,15579,15404,15171,13672,13261,12396,12493,13795,
2006,11924,12670,12654,13899,14635,15386,14938,14690,13753,13197,12409,12517,13556,
2007,12152,12540,13237,14089,14601,15178,14657,14695,13690,13399,12422,12157,13568,
2008,11321,12139,12081,13363,14410,,,,,,,,,
2009,,,,,,,,,,,10222,11115,,
2010,10118,10680,11228,11758,12246,12790,12610,12566,12113,11604,10422,10846,11582,
2011,10208,10478,10686,11727,12380,13023,12544,12353,11640,11508,10388,11316,11521,
2012,10113,10382,10615,12133,12673,12965,12333,12557,12093,11624,10688,11258,11619,
2013,9381,10521,11427,12141,12966,13222,12576,13015,12451,12330,11032,11080,11845,
2014,10410,10902,11876,12759,13040,13387,10990,12006,11675,10570,9333,11001,11496,
2015,9387,11270,13114,14106,14352,14917,13279,12608,12125,12062,11063,11562,12487,
2016,10955,11716,12182,13776,14045,14065,13169,13625,13187,12909,12016,11511,12763,
2017,9280,10053,10731,12212,14415,15253,14452,14571,13498,13983,13123,12980,12879,
2018,11462,11954,12601,14224,14652,14873,13721,14433,13778,13648,12632,12951,13411,
2019,11808,11511,12991,14468,14967,15238,14437,14532,13986,13712,12591,13053,13608,
2020,11851,12686,11056,8991,11595,12869,12771,12995,12784,12797,10933,10905,11853,
2021,10502,10984,12486,13730,14218,14569,14179,14094,13504,13296,12278,12033,12989,
2022,10830,11984,12783,13598,14297,14262,14202,14691,13683,13438,11460,11575,13067,
2023,11111,11719,11678,13717,14295,14336,14116,10881,9027,8876, , ,11976,
2024, , , , , , , , , , , , , ,