YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,8561,9083,9479,9673,10423,10359,9901,9655,9474,9552,9111,8428,9476
1991,8241,9050,9245,9880,10265,10162,10023,9722,11210,10919,9579,9577,9825
1992,9340,9812,9976,10587,10856,11061,10410,10863,11463,10829,9718,10071,10444
1993,9136,9880,10506,10948,11078,11520,11030,10757,11051,10728,9999,9983,10553
1994,9605,9965,10755,11660,11161,11245,9909,10304,10652,10501,9822,9816,10449
1995,9482,9998,10329,10799,11278,11322,10814,10964,10727,10731,10101,10215,10563
1996,9380,10150,10605,11142,11758,12225,11511,11272,11639,11111,10957,10017,10981
1997,10039,10564,10643,11603,12109,11961,11325,11317,11521,11397,10494,10258,11103
1998,10072,10527,10679,11391,11757,11825,11546,11347,11226,11075,10443,10474,11030
1999,9858,10243,10867,11206,11821,12004,11385,11189,11364,11261,10393,10228,10985
2000,9823,10259,10479,11061,11368,11347,11085,10973,10862,10505,9997,9619,10615
2001,9202,9833,10255,10527,10853,10960,11275,11135,11145,10799,10192,9833,10501
2002,9656,9904,10255,10925,11996,11186,10861,10225,10386,10194,9712,9617,10410
2003,9448,9550,9414,10441,11474,10512,10184,11097,12173,9956,8912,9597,10230
2004,9034,9057,9764,10277,10373,10676,10058,10008,10079,9656,9231,9382,9800
2005,8647,9316,9546,10195,10319,10475,9972,10261,10099,10016,9389,9275,9793
2006,8761,9320,9519,9975,10528,9936,9578,10265,10288,,9235,9094
2007,8805,9275,9498,10194,10499,10133,9605,9639,10349,9593,8390,8991,9581
2008,,9235,8957,9987,10255,8235,8086,8145,8334,9041,8426,8674
2009,8260,8724,8641,9760,10239,9381,9211,9192,,9608,8794,8786
2010,8464,9060,9116,9997,10665
2011,,,,,,,,9682,9953,9769