Year	Percent
2005-01-01	43.4
2006-01-01	44.6
2007-01-01	45.4
2008-01-01	46.0
2009-01-01	47.1
2010-01-01	47.9
2011-01-01	48.6
2012-01-01	49.6
2013-01-01	50.6
2014-01-01	51.5
2015-01-01	52.3
2016-01-01	53.3