Year	Percent
2006-01-01	85.075
2007-01-01	85.175
2008-01-01	84.975
2009-01-01	83.750
2010-01-01	82.750
2011-01-01	81.875
2012-01-01	81.750
2013-01-01	81.325
2014-01-01	82.075
2015-01-01	81.700
2016-01-01	81.325
2017-01-01	80.750