YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,9239,9476,9603,9151,8785,8639,8101,9052,579,45,7486,7953,7335
1991,8329,8281,8155,8339,8005,7845,7264,8063,7790,9397,9200,9349,8336
1992,9472,9677,8796,8025,7701,7777,7510,7584,8817,9949,9394,9885,8737
1993,8990,9529,9834,9230,7836,8347,7703,7966,9365,10030,9692,9833,9024
1994,9729,10094,9805,9453,8501,8118,7724,8346,9777,10140,9959,10044,9301
1995,10143,10683,10655,10004,9598,,,7659,9459,10341,9905,9904
1996,9587,10296,10374,9547,7596,,,,,10013,10009,9420
1997,9645,10169,10168,10481,12526,12094,,,,,9962,10144
1998,9832,10878,10794,10992,10631,10293,9776,10440,10017,10455,9923,9668,10308
1999,9857,10379,10592,10542,10346,10200,9203,11296,10329,10389,9934,9745,10234
2000,9951,10321,10511,10479,10208,10120,9464,9832,9868,10147,9752,9880,10044
2001,9625,10180,10455,10330,10158,10113,9704,10137,10282,10372,10100,9208,10055
2002,9729,10102,10257,10228,10681,10281,10361,10010
2003,,,,,,,, 
2004,10423,,11548,11415,10694,11005,7938,5993,6007,11746,10152,9719
2005,9717,10251,10449,9794,9711,9855,9197,9699,9010,9326,9444,9541,9666
2006,9331,10035,10094,10151,10222,9613,8648,,,9012,9126,8863
2007,9603,9527,9584,9666,9556,9316,9048,9404,8866,9470,9304,8854,9350
2008,,9488,,,,,,,9270,9351,8540,8594
2009,8529,9266,8881,9585,9015,8933,8828,8939,9112,9040,8624,8565,8943
2010,8385,9070,9137,9492,9025,9658,9024,9224,9340,9149,8782,8492,9065
2011,8691,9078,8988,9484,9226,9242,9033,9212,9002,9084