Year	Percent
2000-01-01	83.425
2001-01-01	83.300
2002-01-01	83.225
2003-01-01	82.200
2004-01-01	82.400
2005-01-01	82.900
2006-01-01	83.275
2007-01-01	83.900
2008-01-01	85.500
2009-01-01	85.225
2010-01-01	84.325
2011-01-01	84.275
2012-01-01	83.975
2013-01-01	83.975
2014-01-01	84.125
2015-01-01	83.875
2016-01-01	83.775
2017-01-01	83.325