YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
1998	3888	4163	4310	4733	4805	4453	5311	4892	5496	5555	5149	4597	4779
1999	4249	4173	4800	5038	5321	5571	6660	5829	6102	6177	4989	4579	5291
2000	4319	4439	4724	5227	5375	5990	6444	6094	5968	5874		4736
2001		4549	4956	5302	5836	6098	6177	6371	6141		 	 
2002	
2003		 	 
2004	
2005	
2006	
2007	
2008