Year	Percent
2005-01-01	42.5
2006-01-01	42.9
2007-01-01	42.9
2008-01-01	42.4
2009-01-01	39.7
2010-01-01	39.0
2011-01-01	39.1
2012-01-01	39.1
2013-01-01	39.2
2014-01-01	39.6
2015-01-01	40.2
2016-01-01	40.7