Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1998,3888,4163,4310,4733,4805,4453,5311,4892,5496,5555,5149,4597,4779,
1999,4249,4173,4800,5038,5321,5571,6660,5829,6102,6177,4989,4579,5291,
2000,4319,4439,4724,5227,5375,5990,6444,6094,5968,5874,,4736,,
2001,,4549,4956,5302,5836,6098,6177,6371,6141,,,,,
2002,,,,,,,,,,,,,,
2003,,,,,,,,,,,,,,
2004,,,,,,,,,,,,,,
2005,,,,,,,,,,,,,,
2006,,,,,5491,5818,6132,5961,5832,5953,,,,
2007,,,,,,,,,,,,,,
2008,,,,,,,,,,,,,,
2009,,,,,,,,,,,,,,
2010,,,,,,,,,,,,,,
2011,,,,,,,,,,,,,,
2012,,,,,,,,,,,,,,
2013,4273,4564,4886,5135,5479,5689,6182,6055,,5979,4842,4819,5252,
2014,,,,,,,5940,5687,5972,6218,4918,4876,,
2015,4917,5432,5738,5956,6189,6963,7303,7166,6865,,,,,
2016,4959,5264,5383,,,7346,7594,7505,7222,,,,,
2017,4173,4966,5483,6392,6265,6509,6885,7114,7042,,6015,,6079,
2018,5033,5173,4963,5490,6055,6736,,6822,6570,6757,5597,5208,5942,
2019,5013,4772,5473,5936,6121,6804,7021,6954,6878,6932,5779,5314,6022,
2020,4397, , , , , ,6970,6842,7097,7001,5498,5297,6158,
2021,5083,5529,6011, ,6565,7500,7760,7273,7307,6887,6194,5530,6472,
2022,5206,5806,5946,6157,6388,6805,6966,7000, , , , ,6284,
2023, , , , , , , , , , , , , ,
2024, , , , , , , , , , , , , ,