YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
1997	14690	15248	17858		19788	20769	21190	21863	19418	18771	17704	16409
1998	14663	16365	18312	19428		22292	21679	22475	20437	19703	18172	16604
1999	15894	16241	19319	19404	19993	22917	22938	23706	21318	20221	18521	17047	19793
2000	15491	17694	19812	19956	21114	22876	23610	25022	21291	20548	19047	16734	20266
2001	15796	17533	20202	20134	20781	23011	23272	23848	21392	20495	19373	16706	20212
2002	15959	18571	20225	20226	21971	23628	23646	24251	20416	20784	20230	17725	20636
2003	16858	17871	19635	19612	21200	23479	23674	24302	21073	20917	19124	17666	20451
2004	15803	17484	20771	20571	21450	21378		22345	20978		19222	18425
2005	16199	18320	20574	20420	20909	23135	23698	23232	21151	20368	19361	17700	20422
2006	16721
2007					23100	24297	24674	25684	22601	22230	21266	18268
2008			21070	19766	20931	21731	21834	22537	19965	19648	18788	16084
2009	15580	17460	19490	19996	21317	22240	23170	22852	21051

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