YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
2001					15703	17888	17756	18583	18271	18522	18059	17534
2002	18135	18902	19201	20869	21110	20795	20713	21198	20749	21015	19809	19679	20181
2003	19862	20821	20301	21406	21175	21451	21215	20512	20866	20891	18912	19592	20584
2004	18830	19939	20970	21958	21198	21791	20758	20607	21021	20820	20380	20353	20719
2005	19778	21269	21568	21988	21643	22235	20417	21179	20500	20433	20328	20005	20945
2006	20198	20955	21192	21327	21993	22037	20233	21317	20555	20657	20257	19434	20846
2007	19971	20753	21131	21666	21859	21536	20540	21546	20553	21771	20568	19571	20955
2008	19755	20789	20442	21987	21558	20535	20219	20091	20693	21005	19807	19583	20539
2009	19476	20515	20399	22366	21675	21523	23055	22256	20955	21216	20314	20259	21167
2010	19695	20712	21830	22723	21780	22302	21554	21533	20591	20844	20148	20006	21143
2011	20836	21186	21238	22091	21981	22062	21120	21616	21141	21251	20176	20288	21249
2012	19936	20898	20939	21963	21661	21856	20654	21258	21070	21225	20494

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