Year	Percent
2005-01-01	51.0
2006-01-01	51.0
2007-01-01	51.3
2008-01-01	51.5
2009-01-01	52.5
2010-01-01	53.2
2011-01-01	53.2
2012-01-01	53.3
2013-01-01	53.3
2014-01-01	53.3
2015-01-01	53.4
2016-01-01	53.2