Year	Percent
2005-01-01	74.9
2006-01-01	75.4
2007-01-01	75.8
2008-01-01	75.4
2009-01-01	72.8
2010-01-01	72.5
2011-01-01	72.9
2012-01-01	73.0
2013-01-01	73.0
2014-01-01	73.6
2015-01-01	74.1
2016-01-01	74.7