Year	Percent
2005-01-01	87.6
2006-01-01	88.0
2007-01-01	88.4
2008-01-01	87.8
2009-01-01	84.9
2010-01-01	84.7
2011-01-01	85.1
2012-01-01	85.4
2013-01-01	85.3
2014-01-01	85.6
2015-01-01	86.0
2016-01-01	86.4