Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1998,6375,6920,7004,7557,7169,6341,7185,,8033,7336,6653,6429,,
1999,6435,6541,7599,8099,8337,,8134,8188,,8195,7760,7087,,
2000,7070,8307,,,,,,,,,,,,
2001,,,,,,8550,7277,,,,,,,
2002,,,,,,,,,,,,,,
2003,,7727,8212,8518,,,,6700,6644,6454,5554,5535,,
2004,5440,5839,6425,6694,,,6613,6648,6683,6278,5961,5798,,
2005,,,,,,,,,,,,,,
2006,,,,,,,,,,,,,,
2007,,,,,,,,,,,,,,
2008,,,,,,,,,,,,,,
2009,,,,,,,,,,,,,,
2010,,,,,,,,,,,,,,
2011,5093,5069,5232,5529,5569,5684,5533,5734,5933,5355,,5477,5463,
2012,4542,4725,,,,,,,,,,,,
2013,4326,,7288,5433,5282,,,,,,4579,4399,,
2014,4155,4458,4988,5144,4337,4627,5047,5203,4956,4936,4491,4483,,
2015,4651,5386,5526,5381,5361,5559,5902,,,,,,,
2016,4600,4851,5058,5350,5353,5548,,5708,,,4829,,,
2017,4481,,7020,,6113,5831,,5786,5716,5279,5085,5195,5775,
2018,4724,4792,5217,5502,5672,5755,5610,5770,5583,,,,5403,
2019, , , , ,5398,5799,5619, , , , ,5246, ,
2020,5164,5091,4680,4318,5133,5640,5738,5670,5847,5651,4960,5063,5246,
2021,5119,5332,5877,6099,6190,6194,5906,5711,5871,5647,5477,5256,5723,
2022,5127,5411,5704,6443,6394,6537,6060,5951,6118,5951,5253,5164,5843,
2023,5326,5472,5584,6105,6323,6416,6020,6089,6200,6039,5447,5350,5864,
2024,5080,5516,5821, , , , , , , , , , ,