Year	Percent
2005-01-01	70.100
2006-01-01	70.900
2007-01-01	71.500
2008-01-01	72.300
2009-01-01	71.800
2010-01-01	70.075
2011-01-01	70.900
2012-01-01	70.925
2013-01-01	70.775
2014-01-01	71.125
2015-01-01	71.400
2016-01-01	71.825
2017-01-01	71.950