Year	Percent
2000-01-01	66.325
2001-01-01	66.300
2002-01-01	65.025
2003-01-01	66.650
2004-01-01	67.025
2005-01-01	67.925
2006-01-01	69.625
2007-01-01	68.950
2008-01-01	70.300
2009-01-01	70.575
2010-01-01	71.100
2011-01-01	71.475
2012-01-01	71.400
2013-01-01	71.775
2014-01-01	71.325
2015-01-01	73.025
2016-01-01	73.250
2017-01-01	75.050