Year	Percent
2005-01-01	63.975
2006-01-01	64.675
2007-01-01	64.950
2008-01-01	65.150
2009-01-01	65.425
2010-01-01	65.850
2011-01-01	66.875
2012-01-01	67.150
2013-01-01	67.750
2014-01-01	68.150
2015-01-01	68.250
2016-01-01	69.100
2017-01-01	69.500