Year	Percent
2005-01-01	76.0
2006-01-01	76.5
2007-01-01	76.8
2008-01-01	76.3
2009-01-01	73.6
2010-01-01	73.1
2011-01-01	73.5
2012-01-01	73.8
2013-01-01	73.9
2014-01-01	74.5
2015-01-01	74.9
2016-01-01	75.5