Year	Percent
2003-01-01	86.300
2004-01-01	85.750
2005-01-01	86.875
2006-01-01	88.050
2007-01-01	89.125
2008-01-01	87.300
2009-01-01	80.000
2010-01-01	80.100
2011-01-01	80.275
2012-01-01	81.450
2013-01-01	83.175
2014-01-01	85.350
2015-01-01	87.100
2016-01-01	89.400
2017-01-01	88.600