Year	Percent
2006-01-01	66.875
2007-01-01	66.825
2008-01-01	66.550
2009-01-01	64.550
2010-01-01	66.650
2011-01-01	69.225
2012-01-01	69.175
2013-01-01	69.450
2014-01-01	69.525
2015-01-01	69.825
2016-01-01	70.050
2017-01-01	70.725