Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,4720,5100,5338,5473,5549,5444,5492,5631,5580,5584,5122,4691,5311,
1991,4374,5002,5250,5506,5540,5563,5387,5840,5790,5807,5172,4909,5346,
1992,4942,5236,5156,5090,5125,5372,5760,5955,6112,6022,5400,5353,5476,
1993,4908,5383,5636,6157,6237,6312,6182,6700,6651,6490,5906,5814,6034,
1994,5530,5159,5527,6038,6116,6189,6061,6569,6569,6438,5859,5768,5990,
1995,,,,,,,,,,,,,,
1996,,,,,6926,7061,6854,7335,7545,7132,6773,6265,,
1997,6126,6731,7056,7369,7537,7644,7384,7624,,7261,7139,6870,,
1998,6405,6948,7303,7612,7568,7522,7385,7800,7782,7605,7233,6977,7345,
1999,6862,7022,7605,7841,7773,7702,7531,7900,8033,7640,7320,7086,7526,
2000,6867,7306,7675,7957,8137,7890,7576,8111,8077,7730,7433,7308,7672,
2001,6875,7330,7800,8020,7941,7970,7848,8377,8373,8056,7770,7517,7823,
2002,7401,7699,7801,8292,8494,8218,8140,8558,8480,8329,7806,7478,8058,
2003,7405,7733,7811,8164,8336,8202,8056,8263,8369,8166,7246,7399,7929,
2004,6868,7525,8132,8260,8104,7876,7311,7978,8406,8036,7664,7590,7813,
2005,7193,7797,8096,8247,8250,8329,8147,8475,8429,8211,7894,7607,8056,
2006,7660,8205,8567,8735,8993,8998,8580,9027,9071,8976,8625,8115,8629,
2007,7922,8309,8808,8838,8970,8958,8502,8928,8693,8604,8122,7667,8527,
2008,7168,7722,8029,8395,9014,8208,7760,7839,8126,7989,7401,7172,7902,
2009,6972,7461,7602,7993,7367,7627,7754,7847,8099,7695,7392,7184,7583,
2010,6809,7321,7644,7776,7699,7780,7614,7844,8098,7709,7283,6873,7538,
2011,6844,7151,7216,7586,7678,7625,7404,7749,7802,7085,7224,7009,7365,
2012,6633,7148,7258,7812,7774,7765,7593,8048,8047,7849,7475,7192,7550,
2013,6871,7551,8017,8147,8418,8185,7519,7773,8108,8053,7648,7110,7783,
2014,6892,7399,8039,8335,8346,8189,8025,8257,8453,8356,7623,7564,7956,
2015,7436,8088,8551,8932,9056,9099,8790,8868,8866,8811,7985,8036,8543,
2016,7800,8348,8864,9239,9368,9170,8957,9271,9389,9234,8830,8232,8892,
2017,7410,8500,9430,9725,10282,10045,9803,10127,10177,10239,9611,8947,9525,
2018,8474,9065,9551,10013,10416,10107,9837,10191,10198,10008,9430,9008,9691,
2019,8997,9134,10066,10352,10436,10391,9153,10270,10420,10252,9541,9264,9856,
2020,9024,9802,9379,8223,9563,10217,9916,10312,10245,10318,9246,9052,9608,
2021,9095,9508,10456,10691,10732,10857,10737,11303,10940,10872,10041,9314,10379,
2022,9362,10041,10352,10657,10755,10510,10207,10766,10730,10784,9899,9432,10291,
2023,9554,10180,10535,11255,11383,11084,10743,11241,10953,11139,10396,10156,10718,
2024,9385,10741,11102,11545, , , , , , , , , ,