Year	Percent
2000-01-01	83.900
2001-01-01	83.625
2002-01-01	83.800
2003-01-01	83.775
2004-01-01	83.750
2005-01-01	84.150
2006-01-01	84.550
2007-01-01	84.475
2008-01-01	84.825
2009-01-01	85.050
2010-01-01	84.900
2011-01-01	85.275
2012-01-01	85.525
2013-01-01	85.675
2014-01-01	86.000
2015-01-01	85.825
2016-01-01	86.050
2017-01-01	86.550