Year	Percent
2000-01-01	87.450
2001-01-01	87.450
2002-01-01	87.375
2003-01-01	87.525
2004-01-01	87.675
2005-01-01	87.800
2006-01-01	87.925
2007-01-01	88.175
2008-01-01	87.650
2009-01-01	85.650
2010-01-01	85.375
2011-01-01	85.850
2012-01-01	86.575
2013-01-01	86.725
2014-01-01	88.050
2015-01-01	88.325
2016-01-01	89.000
2017-01-01	89.575