Year	Percent
2005-01-01	50.1
2006-01-01	50.5
2007-01-01	50.8
2008-01-01	50.8
2009-01-01	49.9
2010-01-01	49.6
2011-01-01	49.6
2012-01-01	49.7
2013-01-01	50.0
2014-01-01	50.3
2015-01-01	50.6
2016-01-01	51.1