Year	Percent
2005-01-01	78.8
2006-01-01	79.4
2007-01-01	79.9
2008-01-01	79.7
2009-01-01	77.8
2010-01-01	77.5
2011-01-01	77.8
2012-01-01	78.0
2013-01-01	78.1
2014-01-01	78.6
2015-01-01	78.9
2016-01-01	79.5