Year	Percent
2005-01-01	66.1
2006-01-01	66.5
2007-01-01	66.7
2008-01-01	66.3
2009-01-01	63.9
2010-01-01	63.6
2011-01-01	63.8
2012-01-01	63.7
2013-01-01	63.5
2014-01-01	63.8
2015-01-01	64.1
2016-01-01	64.5