YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
1990	8475	9200	10698	11058	11560	12767	12902	13493	11703	10866	10554	8874	11022
1991	8741	11714	13588	10993	11485	13152	13215	13997	12139	11737	10736	10454	11831
1992	9336	10565	11545	11931	12615	14050	14103	14500	13056	12619	11313	10342	12202
1993	9080	10354	11671	12905	14522	14076	15114	15294	13494	12836	12011	11393	12744
1994	10394	10925	13116	13251	13576	14645	15290	16478	14153	13878	12157	11590	13304
1995	10973	11825	13207	13390	13449		16969	16603	14836	13860	13240	11932
1996	10469	12331	14284	14590	15197	16141	16652	17132	15238	14514	13815	12650	14418
1997	11847	13182	14806	14668	14819	16458	16838		15823	14818	14539	13918
1998	12547	13896	15214	15807	16308	17830	18053	18698	16741	16027	15574	14375	15923
1999	13319	14139	16219	16202	16295	17380	18349	19603	17150	16648	16186	14977	16372
2000	13242	14923	16600	16831	17393	18584	19093	19912	17528	16695	15961	15085	16821
2001	13822	14845	16988	16287	17946	19099	19356	19864	18228	17247	16727	15255	17139
2002	14528			17156	19046	20059		20867	18545	18049	17249	16713
2003	15476	16138	16709	18115	18804		20514	21493	19008	18275	17099	16213
2004	13460	16416	18007	18483	18606	19400	20374	20918			18032	16535
2005	14746	16424	18376	18305	18634	20306	20883	20675	18691	17821	17793	16013	18222
2006	15055	16566	18433	19095	19240	20004	20498	20894	19286	18413	18016	16600	18508
2007	15273		18529	19455	19708	20473	20812	21490	19277	18680	18365	16334
2008	13797		18016	17979	18682	19235	19587	19972	17941	17592	17397	15279
2009	13602	14292		18598	19328	19705	20577	20597	19270

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