YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1998,6919,7901,8598,9210,8448,7918,7183,7734,8814,9460,9193,8544,8327
1999,7765,7971,9212,9818,9338,10537,10364,10265,9611,9220,9064,7923,9257
2000,8219,8413,9167,9711,9486,9706,10091,9956,8896,8724,9344,8616,9194
2001,10581,10921,9080,9290,9083,9714,9750,10008,9410,9615,9833,7902,9599
2002,7817,8429,9445,9339,9961,10712,10411,10772,10359,10049,9381,7928,9550
2003,,,,,,,,10489,9855,9540,8021,7112
2004,6844,7210,8287,8832,8303,9336,10036,10236,9507,9032,8037,7547,8601
2005,
2006,
2007,
2008,
2009,