Year	Percent
2000-01-01	68.075
2001-01-01	68.775
2002-01-01	69.525
2003-01-01	69.400
2004-01-01	69.575
2005-01-01	69.750
2006-01-01	70.225
2007-01-01	71.125
2008-01-01	71.800
2009-01-01	72.100
2010-01-01	70.450
2011-01-01	70.000
2012-01-01	70.525
2013-01-01	70.525
2014-01-01	70.050
2015-01-01	70.225
2016-01-01	70.025
2017-01-01	70.050