Year	Percent
2002-01-01	62.2854
2003-01-01	57.6211
2004-01-01	52.8512
2005-01-01	50.8004
2006-01-01	54.0844
2007-01-01	51.7788
2008-01-01	51.8344
2009-01-01	58.3699
2010-01-01	58.2419
2011-01-01	56.9667
2012-01-01	56.9527
2013-01-01	59.1577
2014-01-01	60.9091
2015-01-01	63.4034
2016-01-01	66.2674