YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,13694,14313,15202,15722,16182,16629,15352,15884,15359,15447,14732,13185,15144
1991,13466,15091,16600,18484,17948,17164,16340,16294,15841,15549,14482,14818,16009
1992,15129,15197,15708,16512,17163,16676,15966,15680,15714,15496,14411,14699,15740
1993,12797,14386,15052,16049,16428,16504,15234,15433,15703,15613,15257,14919,15282
1994,14213,15049,16248,17100,17421,17337,16143,16440,16236,16147,15779,14064,16016
1995,,,,,,,,,,,14938,15373
1996,14476,15304,15994,16713,16803,16738,15903,16529,15831,15451,15572,15114,15869
1997,14301,15668,16043,16648,17027,16735,16044,15975,15856,15487,14811,14753,15779
1998,14001,15199,16189,16390,16680,16610,16244,16243,16229,16003,15392,15185,15864
1999,14661,15162,16297,16794,17066,17169,16457,16153,16211,16305,15538,15405,16102
2000,15157,15974,16766,17658,17447,17100,16331,16497,16406,16215,15458,15212,16352
2001,14157,15697,16238,17046,17488,16798,16433,16763,,16511,15502,14970
2002,14918,16010,16339,17410,17702,17414,16708,,,17209,16399,15995
2003,15927,17504,16939,17765,14887,15616,16197,16307,16443,16586,15421,15543,16261
2004,14103,15995,16824,17474,17346,17230,16801,16785,16770,16521,15603,15949,16450
2005,13967,16586,17095,17448,17661,16490,17258,17698,16796,16832,16533,16115,16707
2006,15882,16608,17677,18423,18960,19133,18068,18343,18211,17809,17287,16466,17739
2007,16239,17125,18133,18625,19324,18019,16852,17559,16804,17583,16125,15562,17329
2008,14453,16403,16716,17604,17457,16347,15596,15456,15834,16042,15796,15836,16128
2009,15662,17077,16864,17837,17042,16306,16054,16119,16160