Year	Percent
2001-01-01	69.125
2002-01-01	68.550
2003-01-01	67.900
2004-01-01	67.150
2005-01-01	67.725
2006-01-01	68.700
2007-01-01	69.650
2008-01-01	69.750
2009-01-01	67.175
2010-01-01	67.475
2011-01-01	68.125
2012-01-01	67.875
2013-01-01	68.175
2014-01-01	68.600
2015-01-01	68.800
2016-01-01	68.975
2017-01-01	69.925