YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
1990	20890	23168	24160	23881	27278	28179	26716	27360	24416	23790	23910	23222	24757
1991	21033	23219	24664	25755	27724	27589	27982	27945	24871	24125	24247	26495	25488
1992	24004	25407	27569	30341	32768	29722	29602	29964	28022	28409	27974	29224	28675
1993	25248	26038	28026	30882	30791	27463	27353	27685	26024	30858	28310	31299	28352
1994	25827	26601	30398	33057	33684	35999	34827	34980	29965	31386	28794	31834	31480
1995
1996			31792	33842	34754	36179	35191	35796	32431	28741	31367	31850
1997	29287	30970	31869	32791	34075	33970	33914	35161	33044	33441	32840	34094	32955
1998	31764	34733	36498	37681	38674	39072	37360	37581	35002	34903	33291	33710	35856
1999	31705	32395	35252	37164	37970	37950	36304	36929	34703	34462	33004	33592	35119
2000	30831	32659	33926	35431	35953	36246	34645	35620	33694	33476	31897	32872	33938
2001	29802	31877	33656	34855	35898	36582	35403	36574	33881	34310	33100	32835	34064
2002	30947	32698	33450	35539	36445	35542	34077	36811	35284	35693	34334	35022	34654
2003	33148	34872	35389	37530	39549	37657	37859	38774	38141	38194	35789	36712	36968
2004	33112	35335	37617	39063	38570	39060	38753	38897	37169	36766	35551	37035	37244
2005	33935	36081	37540	38558	38742	39829	38449	40295	37770	37622	36379	37180	37698
2006	35236	37206	38045	39362	40783	40843	39014	40975	38692	38302	37169	37408	38586
2007	35202	36974	39125	39756	39077				38457	38051	36592	36205
2008	33316	35913	36675	38574	39254	37796	37101	37345	35935	36003	34371	34871	36430
2009	33183	34832	35071	36756	32469	34028	34511	35302	34617

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