Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1998,,,,,,,,,,,5569,4725,,
1999,4380,4556,5566,5649,6215,7289,7881,8026,6579,6022,5857,5004,6085,
2000,4472,4749,5722,5866,6296,7292,7768,8022,6590,6039,5566,4974,6113,
2001,4438,4793,5826,5985,6537,7369,7811,8038,6902,6135,6031,5319,6265,
2002,4354,4998,5907,6026,6573,7863,8078,8353,6675,6358,5888,5629,6392,
2003,4933,5023,5952,6143,6795,7867,8554,8601,6828,6591,6022,5484,6566,
2004,4523,4910,6253,6594,6780,7665,8325,8212,7013,6553,6146,5723,6558,
2005,4841,5363,6522,6530,6794,7934,8769,8395,6978,6556,6496,5858,6753,
2006,5200,5577,6586,6863,7147,8343,8810,8476,7473,6980,6781,6082,7027,
2007,5342,5717,6946,7031,7288,8295,8800,8854,7419,7007,6873,5727,7108,
2008,4858,4944,6548,6483,6931,7529,8148,8091,6711,6392,6424,4911,6498,
2009,5040,5371,6413,6514,7160,7955,8828,8472,7221,6683,6423,5593,6806,
2010,5050,5417,6341,6721,7119,8103,9034,8746,7600,6988,6122,5667,6909,
2011,5144,5421,6526,6675,7103,8333,8938,8898,,,,,7130,
2012,,,,,,,,,,,7298,6263,,
2013,5259,5642,7104,7238,7611,8761,9427,9225,7672,7574,6508,6161,7349,
2014,5714,5907,7492,7451,7947,9225,9854,9421,8028,7695,7184,6761,7723,
2015,6231,6326,,,8737,10099,10808,10493,8888,8600,7553,7058,,
2016,6623,7160,8669,8571,9253,10693,11379,10883,9614,9013,8531,7591,8998,
2017,6291,7352,8897,9127,9682,10995,11875,11648,9926,9396,8841,7808,9320,
2018,7076,7541,9103,9394,10095,11366,12088,11401,10069,9439,9156,7893,9552,
2019,7275,7219,9447,9645,10402,11690,12537,11786,10495,10081,8831,8329,9811,
2020,7266,7713,8338,6467,8936,10851,11781,11727,11287,10718,9158,8472,9393,
2021,8168,7894,10490,11053,11935,13393,14139,13192,11986,11252,10897,9195,11133,
2022,8496,9368,11003,11189,12060,13404,13490,13004,12071,11284,10434,8999,11234,
2023,8212,8521,10091,10583,11975,13400,14004,13105,11970,11577,10889,9351,11140,
2024,7935,9172,10651, , , , , , , , , , ,