Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1998,4780,5095,,,6756,6417,7394,7189,9725,8034,6552,5128,,
1999,5316,5439,5935,6645,7246,,9347,9087,8192,7391,6523,6137,,
2000,5675,5828,6032,6586,7264,7762,8794,8504,7378,6803,6173,5577,6865,
2001,5423,5638,5749,6249,7089,7522,8709,8885,7431,6843,6259,5642,6787,
2002,5520,5923,6073,6520,7144,7996,8872,9153,8101,7419,6490,6070,7107,
2003,5249,6059,5924,6616,7196,7951,8844,9177,8258,7235,6070,5941,7043,
2004,5129,6205,6459,7335,7709,,9426,9176,8291,7553,7037,6435,,