YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,10621,11353,13345,13959,13834,15507,16417,16915,15390,13435,13013,10571,13708
1991,10755,12485,13901,14210,14517,15994,17066,18317,16485,14339,13046,12397,14470
1992,11925,13210,14299,15208,15063,16547,17784,17925,17192,15419,13966,12195,15105
1993,10792,12493,14908,15859,15777,17363,19136,19422,18075,16073,14485,13555,15679
1994,13354,13737,16116,16548,16032,17547,18947,19308,18619,15825,14529,13743,16206
1995,13370,14776,15760,16623,16801,18426,19652,19899,18900,17163,16445,15466,16940
1996,13622,15333,16170,16163,,19403,20605,21059,19573,17502,16558,14612
1997,14226,15919,17485,18054,18106,18889,21305,22080,20256,18407,17596,16140,18205
1998,15078,16453,18022,19383,19275,21081,22642,23246,21416,19453,18536,16502,19257
1999,15954,17031,19271,20063,20007,21853,23146,24216,22368,20207,19024,17584,20060
2000,16570,18131,19723,20384,20611,22937,24426,24479,21958,20222,18136,17251,20402
2001,16116,17672,19268,19845,20442,22323,23610,24231,22614,20524,19431,16921,20250
2002,16486,18528,20300,20828,20925,,24267,24608,22651,20927,19775,19132
2003,17950,18804,20067,21274,21910,23466,24804,25408,22890,21331,19884,18324,21343
2004,16890,17399,21184,22067,21340,23080,24865,24432,23289,20298,19724,18575,21095
2005,15854,18655,20708,21162,21038,23111,24626,24470,21880,19990,19146,17799,20703
2006,16842,18582,20241,21271,21181,23497,24371,24432,23503,21154,20241,19050,21197
2007,17663,19313,21441,21894,21908,23920,25198,25257,23798,22014,21349,18293,21837
2008,17302,17902,20422,21277,21248,21964,23584,23316,22479,20812,19959,17326,20633
2009,17613,19231,20384,22343,22148,24174,26266,25174,24534,21892,20638,18940,21945
2010,17944,19933,21557,23029,22464,24549,26765,,24574,22157,19243,18741
2011,18327,19384,20764,22555,22077,23727,25628,25774,24023,22164