Year	Percent
2005-01-01	46.4
2006-01-01	47.7
2007-01-01	48.6
2008-01-01	49.3
2009-01-01	49.6
2010-01-01	50.1
2011-01-01	50.6
2012-01-01	51.6
2013-01-01	52.8
2014-01-01	54.0
2015-01-01	54.8
2016-01-01	55.9