Year	Percent
2000-01-01	66.500
2001-01-01	66.275
2002-01-01	65.425
2003-01-01	64.725
2004-01-01	65.000
2005-01-01	65.725
2006-01-01	65.050
2007-01-01	65.025
2008-01-01	66.025
2009-01-01	66.875
2010-01-01	67.150
2011-01-01	67.550
2012-01-01	67.950
2013-01-01	68.225
2014-01-01	68.575
2015-01-01	68.525
2016-01-01	68.975
2017-01-01	69.375