Year	Percent
2005-01-01	80.0
2006-01-01	80.2
2007-01-01	80.2
2008-01-01	80.2
2009-01-01	79.7
2010-01-01	79.4
2011-01-01	79.3
2012-01-01	79.4
2013-01-01	79.4
2014-01-01	79.5
2015-01-01	79.6
2016-01-01	79.9