Year	Percent
2005-01-01	46.2
2006-01-01	46.8
2007-01-01	46.8
2008-01-01	46.1
2009-01-01	42.5
2010-01-01	42.0
2011-01-01	42.3
2012-01-01	42.3
2013-01-01	42.2
2014-01-01	42.8
2015-01-01	43.2
2016-01-01	43.8