Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,6207,6689,7215,7318,7387,7350,7729,7800,7444,7272,7054,6366,7155,
1991,6382,2535,,,,,,,,,,,,
1992,,7368,7678,7834,7608,7597,8055,7757,7657,7504,7279,6551,,
1993,6507,7614,7817,7974,8546,8691,9281,9048,8580,8574,8219,8121,8252,
1994,7846,8502,9143,9307,9360,9352,9558,9601,9206,9137,8725,8308,9006,
1995,8239,8960,9169,9216,9692,9664,9864,9659,9220,9277,8853,8517,9194,
1996,8210,9021,9405,9615,9627,9597,9652,10554,10996,9868,9415,8867,9569,
1997,8848,9644,10075,10371,10743,10727,10407,9869,10177,10628,10242,9935,10139,
1998,9682,10573,11066,11595,11838,11546,11723,11625,11823,11648,10826,11323,11272,
1999,10869,11433,12160,12008,12298,13095,12901,12626,12310,12996,12032,11326,12171,
2000,11249,12062,12671,12605,12874,12914,12768,12700,12664,12526,12055,11877,12414,
2001,11106,12105,12881,13200,13055,12684,12660,12610,12070,12386,11759,11258,12315,
2002,11172,12079,12392,13202,13281,12778,12880,12963,12791,12795,11873,11487,12474,
2003,10911,11163,11327,12119,13014,12098,11730,11822,11713,11826,11077,11008,11651,
2004,10335,11256,12227,12412,12178,11915,12043,11969,11647,11606,11267,11148,11667,
2005,10659,12038,12658,12473,12747,13376,13118,13184,12259,12105,11936,11588,12345,
2006,11758,12653,13717,13960,14400,14097,13803,13614,13340,13368,13083,11500,13274,
2007,10490,10950,11576,11123,11033,10745,10444,10687,10365,9316,9492,9000,10435,
2008,8843,9628,10222,9853,9947,9420,10002,10196,10407,10524,8753,7404,9600,
2009,7390,7659,7861,8207,10532,9946,10559,10265,10396,10440,10080,9801,9428,
2010,9826,10962,11536,11634,11532,11395,11479,11503,11456,11175,10868,10311,11140,
2011,10520,11165,11345,11780,11882,11466,11370,11450,11114,11129,10696,10515,11203,
2012,10562,11350,11422,12214,11986,11465,11901,11729,11628,11518,11107,10793,11473,
2013,10344,11653,12142,12811,12877,12339,12476,12495,12489,12354,12152,11410,12129,
2014,11411,12382,12998,13702,13322,12771,12889,13034,13198,13134,12333,12097,12773,
2015,12096,13575,13900,14358,14237,14078,13995,14089,13311,13772,13050,12536,13583,
2016,12662,13752,14258,15258,15261,14727,14476,14666,14635,14962,13926,12893,14290,
2017,12366,14751,12678,10789,7920,11392,13385,13879,15118,15314,,,12759,
2018, , , , , , , , , , , , , ,
2019, , , , , , , , , , , , , ,
2020, , , , , , , , , , , , , ,
2021, , , , , , , , , , , , , ,
2022, , , , , , , , , , , , , ,
2023, , , , , , , , , , , , , ,
2024, , , , , , , , , , , , , ,