Year	Percent
2000-01-01	76.225
2001-01-01	77.500
2002-01-01	77.675
2003-01-01	79.175
2004-01-01	79.775
2005-01-01	80.750
2006-01-01	87.350
2007-01-01	89.600
2008-01-01	88.225
2009-01-01	77.400
2010-01-01	75.825
2011-01-01	81.550
2012-01-01	83.075
2013-01-01	84.650
2014-01-01	85.625
2015-01-01	87.725
2016-01-01	87.900
2017-01-01	88.500