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

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