YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
2004					21871	23850	25042	24525	22748	21423	19968	19899
2005	16081	19016	19986	20964	22078	23794	25387	27558	25254	21053	20274	  	20120
2006	17714	18838	19852	20965	23023	24081	24656	24697	22673	21594	19563	18985	21387
2007	16934	18719	20315	20783	22535	26360	24468	24798	22272	21328	19740	16813	21255
2008	13515	15606	17667	19066	21189	21916	23361