YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,29814,31701,33105,33156,32616,33169,31301,32038,30133,31496,28540,26540,31128
1991,27803,30776,31259,32997,31688,31477,30930,31680,30900,31965,31163,31676,31191
1992,31722,32386,32865,33424,31977,34054,32961,36297,40103,40016,37890,37991,35238
1993,34740,39130,42038,41559,39936,44072,41914,43294,44609,44635,43652,44668,42028
1994,42788,41342,48054,47106,46013,48151,45793,47301,47463,44886,44485,42724,45529
1995,44003,45343,46518,47864,46800,49224,46018,48125,49014,50011,48471,46186,47298
1996,45565,48796,49709,50807,49086,50851,47262,49776,50411,51378,50259,46517,49201
1997,47098,51297,51828,53950,52732,55089,50139,52457,53661,52712,52235,51619,52068
1998,50094,55020,56102,57526,56310,59137,54787,56544,56906,57647,55393,55837,55942
1999,55807,57681,59259,68529
2000,
2001,
2002,
2003,
2004,,,,,62772,63610,60799,62669,64634,63250,61620,61202
2005,60566,65678,66291,66154,63693,65043,59546,61675,60855,61520,59766,58468,62438
2006,57183,65360,,,,,,57632
2007,57681,,,,,,69499,72780,70732,74129,69364,64281
2008,62450,68967,68839,,69850,67241,65886,62768,65992
2009,,,,,,,,,72881