Year	Percent
2005-01-01	51.7
2006-01-01	52.7
2007-01-01	53.5
2008-01-01	54.0
2009-01-01	53.7
2010-01-01	54.0
2011-01-01	54.5
2012-01-01	55.5
2013-01-01	56.3
2014-01-01	57.3
2015-01-01	58.1
2016-01-01	59.2