YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,8463,8800,10794,11041,11634,13045,13304,13932,12270,11233,10569,8509,11145
1991,8173,8499,11072,11153,11776,13189,13220,13703,12059,11892,10730,10429,11343
1992,9655,10366,12077,12777,13595,14263,14921,15479,13727,12689,11485,9979,12626
1993,8547,9785,11584,12884,13491,14732,15530,15788,14376,13523,12189,11458,12841
1994,10403,10058,12840,13199,13821,15399,15791,16140,16506,14653,11895,11794,13562
1995,11099,11943,13583,13902,14740,15625,15605,17064,15778,14475,13810,12405,14169
1996,10887,11718,14335,14407,15203,16560,17103,17470,15953,15416,14008,12722,14649
1997,12113,13200,15443,14912,15821,17042,17628,18063,16263,15440,14485,12567,15248
1998,12789,12889,12735,13575,,18105,17155,18075,17297,15311
1999,,,,,,,,,,,16183,14392
2000,13114,14795,16163,16353,17111,18388,18697,19385,17730,16893,15518,14387,16545
2001,13090,14245,16612,17042,17759,18936,19265,19830,18482,17456,16317,14297,16944
2002,13691,15348,16897,17527,18925,19914,20069,19889,18619,18186,16294,17749,17759
2003,,16344,18031,17581,18379,20222,20501,20858,18946,18511,16386,15954
2004,13388,15288,17913,18407,18834,19806,20586,20579,19283,18598,17115,16227,18002
2005,14316,16201,18197,18311,18756,20575,20663,20862,18835,18242,17458,16153,18214
2006,15090,16513,18286,18813,19421,21427,21215,21464,20198,19593,18476,17058,18963
2007,15773,17086,19302,19699,20014,21130,20620,21650,20202,19258,18396,16162,19108
2008,14199,15706,17741,17925,18792,19205,19450,19657,18325,17917,16518,14551,17499
2009,14204,15690,17613,18304,19210,20618,21125,20673,19961