Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,4956,5120,5460,5651,5874,5832,5337,5553,5498,5472,5174,4950,5407,
1991,4667,5061,5525,5905,6271,6158,5711,6360,7103,6503,5792,5750,5904,
1992,5422,5657,6400,6827,7133,6790,6224,6595,6800,6608,6027,6139,6404,
1993,5658,5859,6324,6752,7409,6988,6754,6801,7038,6794,6622,6792,6654,
1994,6224,6437,6949,7504,7717,7618,7171,7346,7487,7418,7033,7111,7171,
1995,6644,7135,7507,7780,8222,7887,7481,7734,7783,7599,7068,7520,7530,
1996,6620,7225,7717,8129,8361,8327,7733,8006,8228,7813,7427,7349,7745,
1997,6873,7412,7531,8254,8829,8538,7787,8369,8334,7960,7776,7822,7957,
1998,7208,7673,7913,8502,8935,8798,8533,8721,8695,8728,8166,8372,8354,
1999,7586,7948,8648,8828,9132,8909,8199,7915,,,,,,
2000,,,,,,,,,,7504,6607,7268,,
2001,6810,7161,7716,8213,8698,8485,8046,8014,7797,7896,7822,7705,7864,
2002,7241,7487,7607,8492,8912,,,,7047,7861,7905,8292,,
2003,8010,8175,8182,9195,9734,9573,8973,9219,9347,9513,8801,8994,8976,
2004,8183,8361,8922,9850,9517,10402,8749,,9164,9417,9348,9632,,
2005,8710,9484,9892,10716,10973,10954,10680,10315,10504,10483,10201,10118,10253,
2006,9568,10196,10363,11346,11832,11500,10934,11793,11416,11068,10812,10831,10972,
2007,9998,10596,11059,10521,9501,10793,11083,11588,10722,11107,10737,10497,10684,
2008,9815,10325,10535,11767,12044,11779,11669,,,,,10162,,
2009,10083,10441,9810,11803,12211,11543,11407,11551,11991,,10338,10202,,
2010,9694,10253,10938,11995,12650,12176,11817,11408,11256,11146,8958,10523,11068,
2011,10400,11111,12384,14293,,14514,12235,11694,11438,11379,11531,11352,12274,
2012,10615,11052,11079,14349,,11678,11122,11505,11366,11289,10856,10817,11430,
2013,10031,10939,11044,11967,12222,11762,13135,11858,11663,11504,10918,10571,11468,
2014,10207,10764,11031,11956,12221,11794,11382,11431,11335,11446,10737,11846,11346,
2015,11299,12310,12302,12381,12297,12422,11820,11945,12301,12173,11283,11208,11978,
2016,10784,11479,11821,12716,12889,13764,13590,13262,12593,12555,12013,11613,12423,
2017,10734,11666,12298,13202,13799,13470,12966,13579,13432,13205,12468,12365,12765,
2018,11899,12277,12553,14027,14397,15622,14461,14881,14380,14590,13052,12475,13718,
2019,11858,12272,12926,14507,14528,14573,12877,12536,12374,12603,12271,11530,12905,
2020,10748,11350,10516,9908,11639,12387,12151,12359,12287,12023,11327,11494,11516,
2021,11342,11928,12916,13458,13412,13184,11968,12713,12777,12766,11863,12832,12597,
2022,11323,12228,14119,13990,14711,15565,15060,13815,11799,11204,10226,10244,12857,
2023,9938,10387,10630,11563,12221,11885,11451,11661,11122,11372,10617,10699,11129,
2024,10199,10928,10950, , , , , , , , , , ,