Year	Percent
2000-01-01	63.900
2001-01-01	63.350
2002-01-01	62.575
2003-01-01	63.675
2004-01-01	63.800
2005-01-01	63.750
2006-01-01	66.050
2007-01-01	66.200
2008-01-01	67.000
2009-01-01	66.700
2010-01-01	66.625
2011-01-01	67.675
2012-01-01	67.950
2013-01-01	68.300
2014-01-01	68.350
2015-01-01	69.725
2016-01-01	70.725
2017-01-01	71.925