Year	Percent
2000-01-01	88.200
2001-01-01	88.625
2002-01-01	87.375
2003-01-01	87.000
2004-01-01	87.800
2005-01-01	88.425
2006-01-01	88.375
2007-01-01	87.800
2008-01-01	85.650
2009-01-01	77.975
2010-01-01	75.200
2011-01-01	74.100
2012-01-01	74.575
2013-01-01	77.000
2014-01-01	79.300
2015-01-01	81.050
2016-01-01	82.200
2017-01-01	84.450