Year	Percent
2001-01-01	48.5761224539252
2002-01-01	48.4191022896572
2003-01-01	48.1011178977246
2004-01-01	47.6352655125515
2005-01-01	47.9653956133870
2006-01-01	48.7587268668588
2007-01-01	49.6379064217032
2008-01-01	49.9061314326524
2009-01-01	48.3973077839375
2010-01-01	48.3103379487556
2011-01-01	49.1112239352966
2012-01-01	49.2278986110231
2013-01-01	49.5123867434190
2014-01-01	49.9638430598734