YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1998,,,,,,,,,,,17491,14236
1999,13448,14312,16826,17299,17688,19322,21452,21445,20658,16139,15300,13810,17308
2000,13863,14883,16581,17052,17626,19440,21314,21400,18851,17530,15589,14953,17424
2001,13832,14927,16526,17449,17360,18759,20558,20641,18592,17300,16687,14515,17262
2002,13774,15365,17070,17664,18409,20023,21390,21607,19398,18069,17074,16367,18018
2003,15219,15993,17228,18317,19056,20461,22085,22467,20089,18960,17140,16004,18585
2004,14615,15687,18185,19467,19020,20979,22876,21723,20798,18736,17667,16833,18882
2005,14309,16701,18532,18875,18913,21015,22354,22080,19619,17820,17165,16164,18629
2006,14946,16498,18054,19026,19167,21077,22299,21900,21778,16127,,16076
2007,15485,17249,19327,19787,19758,21878,23151,22900,21628,19623,19043,16437,19689
2008,15622,15983,18270,19110,19368,20151,21702