Year	Percent
2005-01-01	47.9
2006-01-01	48.6
2007-01-01	48.2
2008-01-01	47.3
2009-01-01	43.3
2010-01-01	42.3
2011-01-01	42.9
2012-01-01	42.7
2013-01-01	42.9
2014-01-01	43.5
2015-01-01	44.0
2016-01-01	44.8