Year	Percent
2005-01-01	50.1
2006-01-01	50.4
2007-01-01	50.5
2008-01-01	50.8
2009-01-01	50.9
2010-01-01	50.9
2011-01-01	50.9
2012-01-01	51.2
2013-01-01	51.3
2014-01-01	51.3
2015-01-01	51.4
2016-01-01	51.7