Year	Percent
2005-01-01	46.6
2006-01-01	47.2
2007-01-01	47.6
2008-01-01	47.7
2009-01-01	47.0
2010-01-01	46.8
2011-01-01	46.9
2012-01-01	47.1
2013-01-01	47.2
2014-01-01	47.5
2015-01-01	47.8
2016-01-01	48.4