Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,3838,3798,4525,5078,5591,6162,7004,6938,6024,5250,4817,4004,5261,
1991,3930,4530,4670,5297,6152,6433,7277,7499,6406,5773,5145,4782,5665,
1992,4493,4939,5567,6154,6882,7349,7875,7864,6773,6294,5536,4882,6239,
1993,4583,4988,5344,6065,7037,7562,7830,8413,7627,6966,6078,5724,6527,
1994,5535,5621,6249,7264,7850,8119,9543,9536,8724,7178,6426,6131,7359,
1995,6166,6507,6671,7561,8561,8736,9488,9407,8542,7331,6835,6742,7712,
1996,,6174,6406,7222,7870,8490,9197,9095,8057,7393,6158,5874,,
1997,5729,6156,6199,7018,8077,8488,9422,9476,8470,7732,7121,6512,7533,
1998,5924,6488,6956,7865,8505,8974,9720,9484,8595,7881,7445,6541,7865,
1999,6316,6470,6906,7776,8499,8896,9403,9768,8968,8152,7486,6956,7966,
2000,6370,6783,7105,7913,8717,9257,9983,9719,8653,8173,7157,6580,8034,
2001,6479,6681,7176,7722,8842,9064,10092,10070,9048,8386,7547,6681,8149,
2002,6611,7106,7045,8141,8995,9437,10285,10343,9326,8667,7946,7433,8445,
2003,7050,7472,7545,8488,9368,9776,10858,9978,9096,8549,7512,7195,8574,
2004,6803,7446,7884,8904,9156,9708,10611,10069,9552,8957,8275,7896,8772,
2005,7231,8080,8294,8811,9610,9948,10460,10479,9360,9007,8522,7790,8966,
2006,7680,8008,8169,8851,9791,10456,11250,10982,10152,9559,8460,8045,9284,
2007,7559,8008,8620,9346,9667,10718,11576,11459,10412,9788,8864,7961,9498,
2008,6813,7860,7953,8405,9698,9797,10715,10678,9708,9302,,,,
2009,,,,9009,10212,10497,11564,11191,10493,9459,8472,8135,,
2010,7844,8319,8706,9290,9993,10438,11346,10783,10128,9321,8052,7528,9312,
2011,7182,7421,7601,8275,9137,9685,10854,10841,9704,8749,7611,7377,8703,
2012,6881,7145,7221,8133,9019,9384,10904,10663,9855,8905,7806,7315,8603,
2013,6884,7329,7690,8240,9425,9904,11045,10600,9453,8836,8034,7224,8722,
2014,6947,7128,7629,8464,9412,9714,10902,10472,9644,8936,8004,7775,8752,
2015,7029,7893,8237,9098,9874,10521,11079,10603,9963,9650,8674,8046,9222,
2016,7770,8327,8767,9908,10439,10967,,9302,9630,9273,8846,8027,,
2017,7641,7929,8355,9546,10580,11235,12036,11716,10744,10446,9224,8538,9832,
2018,8361,8415,9037,10032,11422,11496,12273,11769,11292,10781,9901,9183,10330,
2019,8665,8285,8942,10241,11328,11945,12462,12330,11463,10754,9870,9242,10461,
2020,8456,9350,8342,8400,10471,11903,13117,12764,12249,11245,10106,9792,10516,
2021,10009,10092,10898, ,13341,14097,14430,13363,12591,12157, , ,11968,
2022,9155,9965,10364,11308,11910,12422,13221,12836,12099,11507,9565,8835,11099,
2023,9232,9347,9618,10976,12650,13534,13992,13510,12544,11751,10328,9568,11421,
2024, ,9635,10131, , , , , , , , , , ,