Year	Percent
2006-01-01	87.250
2007-01-01	87.275
2008-01-01	87.500
2009-01-01	87.625
2010-01-01	88.525
2011-01-01	89.175
2012-01-01	88.775
2013-01-01	89.400
2014-01-01	89.800
2015-01-01	90.500
2016-01-01	90.825
2017-01-01	91.150