Year	Percent
2005-01-01	54.8
2006-01-01	55.9
2007-01-01	56.7
2008-01-01	57.3
2009-01-01	56.9
2010-01-01	57.0
2011-01-01	57.5
2012-01-01	58.4
2013-01-01	59.5
2014-01-01	60.6
2015-01-01	61.4
2016-01-01	62.4