Year	Percent
2006-01-01	71.300
2007-01-01	71.850
2008-01-01	71.275
2009-01-01	70.100
2010-01-01	68.875
2011-01-01	67.225
2012-01-01	66.875
2013-01-01	67.000
2014-01-01	66.600
2015-01-01	65.900
2016-01-01	64.350
2017-01-01	63.175