Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,9239,9476,9603,9151,8785,8639,8101,9052,579,45,7486,7953,7335,
1991,8329,8281,8155,8339,8005,7845,7264,8063,7790,9397,9200,9349,8336,
1992,9472,9677,8796,8025,7701,7777,7510,7584,8817,9949,9394,9885,8737,
1993,8990,9529,9834,9230,7836,8347,7703,7966,9365,10030,9692,9833,9024,
1994,9729,10094,9805,9453,8501,8118,7724,8346,9777,10140,9959,10044,9301,
1995,10143,10683,10655,10004,9598,,,7659,9459,10341,9905,9904,,
1996,9587,10296,10374,9547,7596,,,,,10013,10009,9420,,
1997,9645,10169,10168,10481,12526,12094,,,,,9962,10144,,
1998,9832,10878,10794,10992,10631,10293,9776,10440,10017,10455,9923,9668,10308,
1999,9857,10379,10592,10542,10346,10200,9203,11296,10329,10389,9934,9745,10234,
2000,9951,10321,10511,10479,10208,10120,9464,9832,9868,10147,9752,9880,10044,
2001,9625,10180,10455,10330,10158,10113,9704,10137,10282,10372,10100,9208,10055,
2002,9729,10102,10257,10228,10681,10281,10361,10010,,,,,,
2003,,,,,,,,,,,,,,
2004,10423,,11548,11415,10694,11005,7938,5993,6007,11746,10152,9719,,
2005,9717,10251,10449,9794,9711,9855,9197,9699,9010,9326,9444,9541,9666,
2006,9331,10035,10094,10151,10222,9613,8648,,,9012,9126,8863,,
2007,9603,9527,9584,9666,9556,9316,9048,9404,8866,9470,9304,8854,9350,
2008,,9488,,,,,,,9270,9351,8540,8594,,
2009,8529,9266,8881,9585,9015,8933,8828,8939,9112,9040,8624,8565,8943,
2010,8385,9070,9137,9492,9025,9658,9024,9224,9340,9149,8782,8492,9065,
2011,8691,9078,8988,9484,9226,9242,9033,9212,9002,9084,8417,8577,9003,
2012,8730,8938,8735,9305,9041,8893,8576,8917,8884,8728,8698,8045,8791,
2013,7998,8619,8644,8949,8685,8635,8054,8148,8197,8300,8012,7634,8323,
2014,7662,8426,8368,8546,8472,8463,7990,8139,8258,8620,7841,7979,8230,
2015,,,7880,8082,7709,7888,7322,7623,7804,7878,7314,7042,,
2016,7130,7376,7418,7830,7535,7541,7052,7495,7467,7869,7107,6707,7377,
2017,6679,7350,7581,7721,7555,7277,7102,7475,7310,7563,7037,6662,7276,
2018,6975,7281,7237,7704,7170,7249,6187,,6477,6790,6539,6302,6884,
2019,6387,6476,6961,7107,7059,7346,6791,7145,6986,7001,6836,6691,6899,
2020,6515,7058,6053,4506,5574,6349,6184,5362,4391,4688,4268,4265,5434,
2021,4409,4736,5262,4965,6223,7439,7152,7271,7127,6751,7002,6617,6246,
2022,5958,6626,7036,7282,7260,7044,6861,7238,7130, ,6492,6407,6885,
2023,6835,6578,6936,7238,7462,7445,7102,7447,7203,7885,6793,6767,7141,
2024,6438,6703, , , , , , , , , , , ,