YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,11092,11836,12605,13409,18774,20520,14441,13957,13158,13146,12397,12397,13986
1991,11220,12341,12980,13797,13597,13982,14246,14033,13813,13729,12926,12381,13257
1992,11267,12394,20800,21535,21313,22067,22508,15474,15596,15176,14265,13803,17243
1993,12317,13769,14657,15584,15825,16368,15782,15697,15253,15249,14195,14446,14933
1994,13987,14243,15947,16219,16561,16833,15888,16140,16240,16381,14966,14395,15657
1995,14921,15800,16242,16907,17014,16945,16636,16830,17539,16425,15496,14662,16285
1996,14466,15523,16458,18016,16662,16709,16559,16738,17033,16971,16152,14674,16330
1997,14754,16168,16588,16870,17392,17744,17319,17388,17591,17678,17055,16466,16918
1998,15940,17320,18117,18735,18629,18738,18054,18351,18056,18394,17534,16064,17828
1999,15938,,,,,20239,19483,19516,19322,19720,18587,17803
2000,17800,18965,19620,20545,20269,20530,19620,19801,19729,19721,18561,18047,19434
2001,17517,18846,19759,21008,21937,21015
2002,
2003,
2004,,,,,,,,,20191,19516,18837,18484
2005,17396,19415,20113,20694,21377,21529,20124,20443,19676,19780,20977
2006,18623,20423,20465,23098,23103,24144,23872,23543,21797,20392,20560,17699,21477
2007,17619,19846,18857,20106,20517,,,19892,19259,19266,18341,16230
2008,,,16663,17823,17942,18218,16655