Year	Percent
2007-01-01	15.54
2008-01-01	13.04
2009-01-01	14.78
2010-01-01	14.35
2011-01-01	15.46
2012-01-01	13.43
2013-01-01	13.34
2014-01-01	14.30
2015-01-01	13.93