Year	Percent
2005-01-01	65.3
2006-01-01	65.9
2007-01-01	66.4
2008-01-01	66.3
2009-01-01	64.7
2010-01-01	64.4
2011-01-01	64.7
2012-01-01	64.9
2013-01-01	65.1
2014-01-01	65.7
2015-01-01	66.2
2016-01-01	66.9