Year	Percent
2005-01-01	66.925
2006-01-01	68.500
2007-01-01	69.350
2008-01-01	69.700
2009-01-01	70.375
2010-01-01	70.900
2011-01-01	71.900
2012-01-01	71.850
2013-01-01	72.625
2014-01-01	72.875
2015-01-01	73.050
2016-01-01	73.625
2017-01-01	73.975