Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1998,14795,16247,16837,,18675,17622,16872,17873,19597,18790,17198,16583,,
1999,15896,16816,18536,19379,19187,21268,22974,21826,20852,19124,18219,17080,19263,
2000,15926,17369,18651,20007,19622,21011,22705,21530,19919,18574,17409,17000,19144,
2001,16499,17483,18872,19548,19520,20464,21087,21532,19893,18827,19145,17799,19222,
2002,16609,18653,19791,20814,22199,23840,24806,24875,23927,22178,20715,,,
2003,17811,19837,20930,22531,23326,24152,26290,27268,25309,24146,21607,20786,22833,
2004,19512,20961,22690,24436,23535,26670,28747,27368,26283,24424,22768,23955,24279,
2005,,,,,,,,,,,,,,
2006,,,,,,,,,,,,,,
2007,,,,,,,,,,,,,,
2008,,,,,,,,,,,,,,
2009,,,,,,,,,,,,,,
2010,,,,,,,,,,,,,,
2011,19589,20231,20904,21933,22382,24355,26323,24713,24336,22759,,20755,22752,
2012,20014,20694,,,,,,,,,,,,
2013,19339,21102,22301,22914,24269,25831,26987,25533,25030,23665,21537,20606,23260,
2014,20398,21016,22421,23963,24461,26880,,26300,26184,24782,22165,22147,,
2015,21821,23470,24443,25669,26656,29405,30376,27919,28010,26776,24680,23628,26071,
2016,23161,24687,25817,26737,27845,30488,31654,29235,29010,27566,25850,23115,27097,
2017,23493,25132,26859,28233,30006,31640,33523,31686,4988,2267,24785,,23874,
2018,,,,29293,30506,31895,,,,29001,27811,25942,28326,
2019,25960,25767,28481,30629,30935,32744,33981,31528,31689,30481,28422,27514,29846,
2020,25908,27177,28927,21525,27934,32843,32684,33034,35452,33653,27782,26511,29452,
2021, , , , , , , , , , , , , ,
2022,29105,31273,31478,32914,34634,36275,37060,35122,35865,34681,29971,28581,33080,
2023,28815,29898,30432,32911,35566,38337,39835,36879,36649, , , ,34287,
2024, , , , , , , , , , , , , ,