Year	Percent
2005-01-01	49.0
2006-01-01	49.0
2007-01-01	48.7
2008-01-01	48.5
2009-01-01	47.5
2010-01-01	46.8
2011-01-01	46.8
2012-01-01	46.7
2013-01-01	46.7
2014-01-01	46.7
2015-01-01	46.6
2016-01-01	46.8