Year	Percent
2000-01-01	86.775
2001-01-01	86.150
2002-01-01	84.825
2003-01-01	85.175
2004-01-01	85.600
2005-01-01	85.775
2006-01-01	89.025
2007-01-01	88.475
2008-01-01	88.150
2009-01-01	87.800
2010-01-01	88.275
2011-01-01	88.350
2012-01-01	87.775
2013-01-01	87.625
2014-01-01	87.075
2015-01-01	87.900
2016-01-01	87.800
2017-01-01	88.575