YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
1990	39782	42283	46222	46929	48166	51768	50094	50446	46480	46936	46075	39792	46263
1991	40540	44798	46465	48789	49547	57503	56208	58188	53533	54158	48542	47831	50538
1992	46292	49007	52508	54021	54825	59229	59154	55325	55438	57615	47087	44325	53057
1993	39793	44493	49306	50282	54081	57413	56720	57725	58255	55533	53237	51570	52405
1994	46311	51218	53210	52509	54670	59148	55412	57854	53963	50069	46805	46719	52325
1995	46538
1996									62558	59176	58983	56871
1997	54390	58708	61521	62085	63684	67237	65771	67378	64372	63509	61458	61295	62617
1998	57220	61997	64954	66512	66531	72263	72445	72025	68975	68967	65734	64186	66817
1999	61845	63137	67387	68981	70296	74918	73203	73966	70259	70720	67396	65393	68958
2000	61896	66737	70267	72220	73550	77763	75332	77871	73307	73185	69304	68510	71662
2001	64066	69396	73740	74895	75082	78335	75792	78159	72343	72324	69283	63050	72205
2002	63877	68528	70357	73823	75176	77057	75551	76199	71412	73300	69031	67719	71836
2003	66129	68339	69072	71759	73555	76214	76228	75940	72976	73251	67638	68479	71632
2004	62372	67541	73328	74431	73689	76618	77109	77498	74057	73518	71373	71287	72735
2005	65933	70814	74575	75459	75337	78878	76824	79965	74612	74236	71445	69830	73992
2006	67949	71625	74933	75469
2007					74467	77604	76100	78259	72927	68967	68371	65078
2008	60665	66702	68499

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