Year	Percent
2005-01-01	53.5
2006-01-01	53.6
2007-01-01	53.2
2008-01-01	53.1
2009-01-01	51.6
2010-01-01	50.9
2011-01-01	50.9
2012-01-01	50.8
2013-01-01	50.6
2014-01-01	50.6
2015-01-01	50.4
2016-01-01	50.5