Year	Percent
2005-01-01	70.0
2006-01-01	70.3
2007-01-01	70.4
2008-01-01	70.6
2009-01-01	70.5
2010-01-01	70.4
2011-01-01	70.5
2012-01-01	70.7
2013-01-01	70.9
2014-01-01	71.0
2015-01-01	71.2
2016-01-01	71.6