Year	Percent
2005-01-01	55.9
2006-01-01	56.6
2007-01-01	57.2
2008-01-01	57.4
2009-01-01	56.6
2010-01-01	56.5
2011-01-01	56.7
2012-01-01	57.0
2013-01-01	57.4
2014-01-01	57.9
2015-01-01	58.5
2016-01-01	59.3