YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1995,21416,23947,24795,25346,24533,25252,25773,26175,25956,26205,24616,22534,24712
1996,20196,23554,24272,26523,,26134,25746, ,27229,26177,25053,21305
1997,22218,25200,25838,25779,25790,26940,26843,28561,28583,28262,26423,23995,26203
1998,23405,26252,26936,27978,28497
1999,
2000,,,30379,29914,29455,30913,30756,30495,30844,30769,27434,26128
2001,25182,28534,30284,30844,30959,31305,31155,32577,31598,31582,29770,24822,29884
2002,25801,28738,30321,30219,30843,28392,30516,33683,31713,32257,29110,28447,30003
2003,28291,29979,30515,32761,32507,32128,33083,33274,,33908,30361,27915
2004,26814,29289,31613,34244,31849,33200,33381,,31557,33254,31030,28866
2005,24481,33715,32533,33602,31767,32965,33130,34064,32700,31697,29937,27435,31502
2006,27685,30205,31472,32484,,,,,,,27702,27058
2007,27934,30259,31072,31563,30769,30822,31257,31350,30959,31486,30189,25766,30286
2008,25984,27864,29830,31727,30554,30441,31402,31419,31831,32066,29860,26623,29967
2009,27403,30343,30340,34554,,,,33542,33599,32702,30334,27607
2010,27555,30365,31421,33815,31203,32358,33383,33443,33507,32135,28556,27311,31254
2011,28022,29302,30262,33137,31445,32276,32776,33660,33617,32956