Year	Percent
2005-01-01	54.1
2006-01-01	55.1
2007-01-01	55.7
2008-01-01	56.3
2009-01-01	56.9
2010-01-01	57.4
2011-01-01	57.9
2012-01-01	58.8
2013-01-01	59.7
2014-01-01	60.5
2015-01-01	61.1
2016-01-01	62.1