YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1998,,,,,,,,,,14467,11997,8361
1999,10139,10460,11806,13460,15062,17594,19378,21411,19365,16511,14611,13165,15247
2000,10162,10934,12405,13966,15586,17890,20840,18899,15546,13488,12078,11124,14410
2001,10395,10890,12226,13068,15707,18383,20148,21196,,,,11222
2002,10424,11372,11779,14947,16176,19357,21242,21283,18433,14753,12587,11399,15313
2003,10165,10932,12740,13523,15437,19681,21540,23130,,15828
2004,,,,,,,,21120,17873,15828,13497,12021
2005,
2006,
2007,
2008,