Year	Percent
2006-01-01	15.975
2007-01-01	17.125
2008-01-01	18.250
2009-01-01	23.025
2010-01-01	19.300
2011-01-01	15.600
2012-01-01	14.625
2013-01-01	15.500
2014-01-01	16.600
2015-01-01	16.500
2016-01-01	17.250
2017-01-01	17.775