Year	Percent
2000-01-01	64.975
2001-01-01	66.375
2002-01-01	66.675
2003-01-01	66.350
2004-01-01	66.875
2005-01-01	67.725
2006-01-01	68.575
2007-01-01	69.225
2008-01-01	68.475
2009-01-01	65.600
2010-01-01	64.225
2011-01-01	63.950
2012-01-01	63.500
2013-01-01	66.725
2014-01-01	67.975
2015-01-01	70.650
2016-01-01	70.425
2017-01-01	70.875