YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,8275,8923,9895,9969,10319,10475,10058,10629,10282,10175,9264,8147,9704
1991,8023,9097,9762,10535,10525,10910,10175,10737,10489,10483,9381,8818,9913
1992,9029,9786,10613,10813,10677,11077,11329,11094,10989,10514,9599,9313,10432
1993,8623,9370,10074,11445,11487,11987,11773,11836,11776,11621,11192,10855,11010
1994,9772,10412,11537,11302,11262,11821,11438,12090,12105,11691,11000,10157,11219
1995,10475,11055,11546,12469,12390,12748,12274,12485,12083,12150,10597,10128,11700
1996,10427,10971,11729,12193,12226,12564,12273,12618,12601,12222,11351,10035,11768
1997,10201,11458,12203,12251,12337,13196,12607,12957,12888,12169,11662,11035,12080
1998,10582,11497,12300,12679,12647,13042,12498,12904,12632,12449,11843,11251,12194
1999,11041,11327,12490,12729,13075,12865,12668,12972,12502,12340,12114,10985,12259
2000,10635,11674,12153,12922,12985,13137,,12580,12637,12296,11408,10748
2001,10385,11113,12205,12714,12776,13087,12717,13010,12903,12498,11692,10791,12158
2002,11131,11848,12338,13454,13582,13770,12874,13246,13186,13435,12227,11375,12706
2003,11659,12247,11619
2004,,,13065,13031,12541,13123,12623,12952,13057,12657,12133,11863
2005,11274,12358,12954,13154,13056,13764,13401,14039,13338,13072,12343,11670,12869
2006,11833,12654,13589,14235,14425,14425,13660,14511,14240,14332,13507,12481,13658
2007,12535,13095,13989,13883,13795,12919,12290,13084,13159,13080,12226,11557,12968
2008,11082,12358,12882,13604,13368,12686,11991,12283,12582,12600,11665,11403,12375
2009,11057,12096,12482,13137,11596,11996,11839,12178,12363