YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
1990	16645	17708	18683	18347	18599	17526	17464	16655	16775	18141	19400	19206	17930
1991	18573	19643	19028	20622	20636	21121	20276	20441	20278	20679	19442	20072	20068
1992	20466	21694	21169	21677	20571	20391	20492	18773	18132	17410	15762	16217	19441
1993	15008	16097	16936	17801	17003	17264	16583	16542	16262	15121	13682	14090	16029
1994	13033	13943	14670	15419	14728	15559	15716	15775	15450	15325	14521	14530	14893
1995	14702	15469	15678	16386	16100	15043	13947	15253	15029	14553	13294	13108	14880
1996	12958	12694		16885	15862	17476	15428	15581	15689	15409	14411	13950
1997	13968	14577	15051	15427	15276	15917	14545	15140	15204	15035	14124	14084	14862
1998	13775	14701	14984	15596	15116	16012	14754	15335	16126	16334	15069	13953	15146
1999	14081	14461	15176	15757	16252	16987	15211	15568	15212	15173	14087	14031	15166
2000	15020	15811	16012	16195	15701	16757	15087	15793	15532	15400	14630	14533	15539
2001	14139	14851	15250	15617	15400	16877	15065	15374	14656	14409	13632	13072	14862
2002	13332	13784	14095	15667	15249	15547	14568	14115	14339	14181	13172	12957	14251
2003	14233	14528	14393	15519	15334	16251	14177	13861	14048	13688	11781	12607	14202
2004	11988	12716	13002	15212	13331	14229	13152	13371	13184	12707	12056	12193	13095
2005	11850	12588	13037	13329	13144	13767	11489	13581	13057	12789	12121	11866	12718
2006	11883	12322	12638	12906	13156	13426	11465	13317	13068	13089	12169	11715	12596
2007	11798	12243	12883	13117	13206	12992		12958	12558	12935	11849	11482
2008	11263	12317	12397

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