YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1998,,,,,,,,,,17446,16114,15068
1999,15258,16355,16149,15107,13530,12756,12445,14032,14267,14827,12784,12321,14153
2000,12000,13373,13190,14946,13333,12519,12281,13477,12362,14053,12251,11827,12968
2001,11365,13161,12700,14416,13695,12465,12216,13946,14485,14621,12848,12364,13190
2002,12136,13623,13018,15430,14287,12995,12805,14247,14993,15231,14123,13143,13836
2003,12913,14370,13371,15678,14555,13504,13415,14795,15476,15880,13204,13231,14199
2004,12459,14204,14053,16091,13978,13512,13132,15105,15628,16210,13823,13120,14276
2005,13137,14572,14127,15728,14035,13379,12752,15123,14792,15133,13484,12287,14046
2006,13171,14138,13858,15180,13819,12977,12006,14194,14200,14513,12784,11851,13558
2007,12358,13307,13472,14586,12953,13304,,16876,16721,17112,15930,14079
2008,14299,16254,15918,18429,16396,15112