YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,4453,4358,5068,5738,6031,6444,7367,7510,6389,5564,5080,4234,5695
1991,3941,4655,4981,5688,6169,6683,7793,8111,6830,6024,5305,5049,5944
1992,4675,5112,5757,6358,6804,7302,8618,8644,7223,6388,5596,5034,6483
1993,4737,5367,5921,6513,6895,7559,8565,8773,7117,6567,5809,5348,6606
1994,5361,5310,6177,6753,7053,7706,8397,8302,7608,6826,5860,5499,6747
1995,5390,5646,6128,6928,7410,7727,8521,8685,7822,7079,6391,5838,6964
1996,5358,5788,6400,7157,7498,8030,8920,9277,8412,7409,6068,5710,7169
1997,5491,6178,6164,7105,7939,8593,9192,9385,7850,7510,6821,6382,7384
1998,5870,6482,7137,7766,8216,8512,9024,9050,8453,, , 
1999,
2000,,,,,,,9026,8859,7855,7409,6730,5917
2001,5902,6033,6720,7164,7777,8034,8759,8954,7838,7085,6684,5971,7243
2002,6023,6480,6705,7627,7943,8317,9128,9339,8408,7896,7238,6505,7634
2003,6345,6825,6817,7668,8176,8549,9144,9053,8427,7866,6780,6468,7677
2004,6252,6942,7433,8025,8273,8803,9313,9155,8572,7971,7543,6873,7930
2005,6180,7039,7466,7751,8217,8617,9138,9282,8262,7640,7259,6540,7783
2006,6492,6886,7406,7882,8517,8718,9173,9121,8416,7896,7065,6507,7840
2007,6321,6774,7288,7817,8386,8748,9436,9540,8523,8242,7625,6484,7932
2008,6229,6747,7153,7642,8491,8324,8946