YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
1998											17491	14236
1999	13448	14312	16826	17299	17688	19322	21452	21445	20658	16139	15300	13810	17308
2000	13863	14883	16581	17052	17626	19440	21314	21400	18851	17530	15589	14953	17424
2001	13832	14927	16526	17449	17360	18759	20558	20641	18592	17300	16687	14515	17262
2002	13774	15365	17070	17664	18409	20023	21390	21607	19398	18069	17074	16367	18018
2003	15219	15993	17228	18317	19056	20461	22085	22467	20089	18960	17140	16004	18585
2004	14615	15687	18185	19467	19020	20979	22876	21723	20798	18736	17667	16833	18882
2005	14309	16701	18532	18875	18913	21015	22354	22080	19619	17820	17165	16164	18629
2006	14946	16498	18054	19026	19167	21077	22299	21900	21778	16127		16076
2007	15485	17249	19327	19787	19758	21878	23151	22900	21628	19623	19043	16437	19689
2008	15622	15983	18270	19110	19368	20151	21702