YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,39782,42283,46222,46929,48166,51768,50094,50446,46480,46936,46075,39792,46263
1991,40540,44798,46465,48789,49547,57503,56208,58188,53533,54158,48542,47831,50538
1992,46292,49007,52508,54021,54825,59229,59154,55325,55438,57615,47087,44325,53057
1993,39793,44493,49306,50282,54081,57413,56720,57725,58255,55533,53237,51570,52405
1994,46311,51218,53210,52509,54670,59148,55412,57854,53963,50069,46805,46719,52325
1995,46538
1996,,,,,,,,,62558,59176,58983,56871
1997,54390,58708,61521,62085,63684,67237,65771,67378,64372,63509,61458,61295,62617
1998,57220,61997,64954,66512,66531,72263,72445,72025,68975,68967,65734,64186,66817
1999,61845,63137,67387,68981,70296,74918,73203,73966,70259,70720,67396,65393,68958
2000,61896,66737,70267,72220,73550,77763,75332,77871,73307,73185,69304,68510,71662
2001,64066,69396,73740,74895,75082,78335,75792,78159,72343,72324,69283,63050,72205
2002,63877,68528,70357,73823,75176,77057,75551,76199,71412,73300,69031,67719,71836
2003,66129,68339,69072,71759,73555,76214,76228,75940,72976,73251,67638,68479,71632
2004,62372,67541,73328,74431,73689,76618,77109,77498,74057,73518,71373,71287,72735
2005,65933,70814,74575,75459,75337,78878,76824,79965,74612,74236,71445,69830,73992
2006,67949,71625,74933,75469
2007,,,,,74467,77604,76100,78259,72927,68967,68371,65078
2008,60665,66702,68499,69687,70650,71168,69389