Year	Percent
2005-01-01	46.6
2006-01-01	47.0
2007-01-01	46.8
2008-01-01	46.1
2009-01-01	43.0
2010-01-01	41.8
2011-01-01	42.1
2012-01-01	42.0
2013-01-01	42.3
2014-01-01	42.9
2015-01-01	43.4
2016-01-01	44.2