YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1992,48001,50114,52840,56149,53067,58805,58449,56611,55263,50390,50304,47420,53258
1993,41250,45844,51183,54520,50929,57310,55868,56863,55617,52537,50821,52507,52129
1994,48093,50180,55187,55477,57307,61332,57255,58275,58586,55589,53773,55557,55576
1995,
1996,
1997,,58494,61557,62826,64313,67988,67029,68069,65509,64568,63199,63664
1998,59322,64500,66975,68420,67797,73734,71872,73487,70289,70233,69711,67151,68624
1999,64574,65961,68993,70932,71367,75984,73951,71989,65428,66454,62369,62243,68354
2000,59140,62987,66179,81075,82784,86575,83534,85118,80712,82190,79169,73996,76955
2001,68760,74525,79043,80941,80904,84019,81821,84735,79280,77390,74417,72141,78165
2002,72156,76901,78302,82191
2003,
2004,
2005,
2006,
2007,
2008,
2009,