Year	Percent
2005-01-01	41.6
2006-01-01	42.9
2007-01-01	43.7
2008-01-01	44.3
2009-01-01	44.7
2010-01-01	45.4
2011-01-01	46.1
2012-01-01	47.1
2013-01-01	48.1
2014-01-01	49.1
2015-01-01	50.0
2016-01-01	51.1