Year	Percent
2000-01-01	65.775
2001-01-01	65.525
2002-01-01	64.600
2003-01-01	63.950
2004-01-01	63.975
2005-01-01	64.350
2006-01-01	63.350
2007-01-01	63.175
2008-01-01	63.825
2009-01-01	64.675
2010-01-01	65.325
2011-01-01	65.725
2012-01-01	66.475
2013-01-01	66.975
2014-01-01	67.875
2015-01-01	68.100
2016-01-01	68.800
2017-01-01	69.550