YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,14203,14947,16112,16082,16099,16505,15895,16452,14861,15177,15885,17791,15841
1991,13644,14897,15528,15819,16270,16344,16367,14811,11701,13929,15614,17293,15191
1992,14601,15555,15796,16452,16366,16128,16242,16468,15692,15950,15707,17761,16107
1993,14402,15547,16407,16830,17019,17472,17530,17635,17013,17280,17213,19174,16970
1994,16224,17522,17691,17670,17816,18363,18368,18734,17519,17812,18023,20114,17993
1995,,,13784,,,18347,17429,18348,17523,17823,18632,20443
1996,16748,18390,18535,18554,18751,19042,18240,18745,18169,17882,18237,19386,18390
1997,16383,17643,17943,18180,18587,18734,18510,18849,17669,18123,18545,20377,18295
1998,17395,18143,18740,18913,19496,19671,19380,19811,18635,19044,19274,20837,19112
1999,17860,18771,19233,19648,20166,20498,20026,20303,19435,19639,19575,21153,19692
2000,17815,18993,19110,19489,19539,19988,20795,22736,21006,19970,19669,21091,20017
2001,17768,18736,19339,18728,19127,19553,19572,19892,18397,18446,19251,20043,19071
2002,17382,18405,18799,18625,18874,18412,18475,19479,17842,18246,18798,20137,18623
2003,17478,17567,16711,17336,17889,17916,17423,17715,17410,18906,18733,20170,17938
2004,17884,18029,19089,19249,18855,19360,19326,19121,17731,18075,18433,20416,18797
2005,16814,18249,18310,18507,18786,19036,18910,19416,17433,17549,17980,20192,18432
2006,17094,18137,18792,19167,19520,19818,19257,19243,18103,18903,19791,21464,19107
2007,18384,19591,20401,20194,20754,20863,20553,21444,20048,20436,20612,21741,20418
2008,18797,20076,20460,21189,21959,21689,21333,21244,20319,21445,21790,22746,21087
2009,20464,21489,21279,23179,23439,22249,22141,22112,20693,22371,21284,23046,21979
2010,20086,21510,21644,23974,21452,22187,21317,21516,20523,21053,20560,23063,21574
2011,19924,20985,21178,21674,22192,23240,20850,22481,21003,21416