Year	Percent
2005-01-01	63.7
2006-01-01	64.4
2007-01-01	65.3
2008-01-01	65.7
2009-01-01	64.6
2010-01-01	64.3
2011-01-01	64.6
2012-01-01	65.7
2013-01-01	66.5
2014-01-01	67.6
2015-01-01	68.3
2016-01-01	69.2