Year	Percent
2005-01-01	62.3
2006-01-01	63.2
2007-01-01	63.9
2008-01-01	64.3
2009-01-01	63.2
2010-01-01	63.0
2011-01-01	63.5
2012-01-01	64.4
2013-01-01	65.1
2014-01-01	66.1
2015-01-01	66.8
2016-01-01	67.8