Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,2877,3142,3462,3712,3826,3981,3986,4038,3670,3570,3334,2837,3538,
1991,2763,3188,3378,3546,3852,3898,3967,4067,3834,3971,3600,3389,3624,
1992,3293,3153,3281,3502,3668,3672,3776,3848,3861,3795,3453,3147,3548,
1993,2939,3159,3432,3829,4002,3990,4067,4210,4088,4195,3751,3647,3779,
1994,3360,3618,4048,4318,4491,4627,4495,4597,4499,4564,3954,3750,4197,
1995,3677,3984,4209,4563,4626,4633,4684,4751,4663,4762,4297,4036,4407,
1996,3804,4099,4375,4773,4750,4698,4975,5385,5306,5234,4702,3967,4672,
1997,3913,4327,4556,4812,5067,5263,5329,5255,5093,5079,4744,4768,4851,
1998,4778,5014,5347,5647,5730,6054,5592,5945,5795,5686,5282,4946,5485,
1999,4946,4779,5306,5770,5638,5880,5960,5974,5668,5885,5409,5238,5538,
2000,5011,5355,5552,5919,5958,6053,5987,5996,5744,5753,5396,5207,5661,
2001,4843,5149,6078,6577,6281,6332,5966,6034,6019,6149,5673,5308,5867,
2002,5139,5531,5842,6460,7684,6927,6671,6708,6590,6548,5959,5727,6316,
2003,4718,4916,5763,6610,8721,7326,6881,6543,6343,6752,6170,6133,6406,
2004,5387,5927,6822,7293,7052,7538,7566,7293,7400,7328,6811,6822,6937,
2005,6445,7120,7825,8196,8375,9057,8707,9107,8730,8822,8121,7736,8187,
2006,7750,8530,9044,9415,9759,10037,9321,9791,9183,9551,8919,8329,9136,
2007,8287,8757,9495,10149,10266,10623,10106,10112,9621,9833,8982,8353,9549,
2008,7746,8429,8734,9335,9360,9218,8815,8554,8631,8440,7765,7532,8547,
2009,7272,7912,8029,8934,9132,9231,9256,9075,9028,8859,8187,7892,8567,
2010,7537,8079,8536,9049,9006,9368,8725,8972,8953,8824,8241,7855,8595,
2011,7736,8149,8418,9016,9118,9402,9225,9485,9563,9430,8512,8557,8884,
2012,8038,8641,8749,9601,9752,9746,9954,10414,10267,10221,9420,9381,9515,
2013,8325,9572,10385,11314,11788,11840,11630,11515,11496,11390,10520,9569,10779,
2014,9292,9695,10528,11110,11507,11560,11265,9896,8299,8291,7173,7517,9678,
2015,7324,7910,8309,8677,8697,8863,8647,8535,8513,8585,8025,7790,8323,
2016,7582,8146,8368,9071,8980,9189,8961,8940,8772,8833,8355,7543,8562,
2017,6639,8009,8698,9576,8994,8693,9268,9376,8981,9383,8966,8605,8766,
2018,8233,8904,9060,9865,10050,10088,10081,10188,10016,9970,9531,9218,9600,
2019,8834,8829,9810,10612,10407,10392,10177,10517,10350,10301,9971,9617,9985,
2020,9385,10194,9072,7887,9513,10379,10736,10848,10748,10613,9674,9937,9915,
2021,9930,9894,10019,10890,11274,11645,11226,10453,9676, , , ,10556,
2022, , , , , ,11397,11509,11695,11253,11473,10184,9686,11028,
2023,9931,10274,10290,11293,11632,8293,11114,11745,11665,11396,10668,10751,10754,
2024,9805,11233,11862, , , , , , , , , , ,