Year	Percent
2005-01-01	70.3
2006-01-01	71.0
2007-01-01	71.5
2008-01-01	71.7
2009-01-01	70.7
2010-01-01	70.5
2011-01-01	70.6
2012-01-01	70.8
2013-01-01	71.1
2014-01-01	71.6
2015-01-01	72.0
2016-01-01	72.7