Year	Percent
2005-01-01	65.5
2006-01-01	66.1
2007-01-01	66.7
2008-01-01	67.1
2009-01-01	67.4
2010-01-01	67.5
2011-01-01	67.7
2012-01-01	68.6
2013-01-01	69.3
2014-01-01	70.0
2015-01-01	70.5
2016-01-01	71.4