Year	Percent
2000-01-01	83.825
2001-01-01	83.050
2002-01-01	81.325
2003-01-01	82.400
2004-01-01	83.000
2005-01-01	83.250
2006-01-01	85.550
2007-01-01	83.650
2008-01-01	83.700
2009-01-01	83.775
2010-01-01	84.775
2011-01-01	84.700
2012-01-01	83.525
2013-01-01	82.925
2014-01-01	82.000
2015-01-01	83.025
2016-01-01	81.775
2017-01-01	83.700