Year	Percent
2000-01-01	67.325
2001-01-01	66.100
2002-01-01	65.550
2003-01-01	66.075
2004-01-01	65.800
2005-01-01	64.925
2006-01-01	67.650
2007-01-01	68.350
2008-01-01	68.750
2009-01-01	67.925
2010-01-01	66.950
2011-01-01	68.025
2012-01-01	68.350
2013-01-01	68.400
2014-01-01	68.875
2015-01-01	69.450
2016-01-01	70.575
2017-01-01	71.400