YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1998,3888,4163,4310,4733,4805,4453,5311,4892,5496,5555,5149,4597,4779
1999,4249,4173,4800,5038,5321,5571,6660,5829,6102,6177,4989,4579,5291
2000,4319,4439,4724,5227,5375,5990,6444,6094,5968,5874,,4736
2001,,4549,4956,5302,5836,6098,6177,6371,6141,, , 
2002,
2003,, , 
2004,
2005,
2006,
2007,
2008,