Year	Percent
2006-01-01	74.950
2007-01-01	74.825
2008-01-01	73.850
2009-01-01	72.175
2010-01-01	70.375
2011-01-01	68.950
2012-01-01	68.225
2013-01-01	66.750
2014-01-01	66.450
2015-01-01	65.100
2016-01-01	63.825
2017-01-01	62.475