YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,16354,17438,19891,20770,19800,20091,18936,19408,18269,18517,19685,18518,18978
1991,18518,19773,20334,21125,22693,21130,20706,21514,19980,20283,18868,18648,20302
1992,18830,19809,20538,21791,21211,20994,20334,20563,20754,20612,19017,18827,20327
1993,17944,19791,20849,22013,21597,21959,21247,22186,19845,20025,19871,21234,20719
1994,19629,20800,23114,23041,23182,22840,21805,23473,22638,22799,22426,22459,22359
1995,21904,23542,26206,26581,25832,27981,25480,25839,25527,24553,23494,24556,25125
1996,23775,23673,24838,22237,21977,23283,21707,22008,22968,23936,22033,20170,22717
1997,19479,23026,20791,21369,21623,21936,20603,21082,20785,20607,19733,19648,20890
1998,18796,20311,20999,21967,21758,22152,21066,21306,20409,19355,18465,19960,20545
1999,19028,19337,19003,19554,19569,21458,22661,23604,23553,23765,23100,23860,21541
2000,23621,25100,25862,26939,26978,27489,26077,26867,26346,26123,25055,25319,25981
2001,23930,25570,26442,27539,27690,25632,23956,25422,26535,26751,25946,25187,25883
2002,25219,26626,26704,29010,28739,28735,27942,27947,26813,26884,25545,25190,27113
2003,25274,26422,26249,27931,28387,28613,27699,27396,27308,27405,25196,25771,26971
2004,24111,25512,26622,28103,26909,,,,,25491,25160,25452
2005,23773,25938,26787,27528,28043,28261,26537,27782,26649,26085,25318,25057,26480
2006,24740,26120,26734,27528,28498,28795,24773,26918,26234,26145,25448,24824,26396
2007,24122,25155,26922,26798,28184,28082,26623,27486,26134,26619,25336,24225,26307
2008,23482,25061,25189,26723,26739,26107,25064,24974,25020,24799,23253,23445,24988
2009,22885,24294,24414,26628,29043,27002,25609,25103,25333