Year	Percent
2005-01-01	13.0
2006-01-01	12.4
2007-01-01	11.6
2008-01-01	12.2
2009-01-01	15.1
2010-01-01	15.7
2011-01-01	15.7
2012-01-01	15.7
2013-01-01	15.6
2014-01-01	14.6
2015-01-01	13.4
2016-01-01	12.5