Year	Percent
2003-01-01	89.625
2004-01-01	88.525
2005-01-01	89.275
2006-01-01	90.500
2007-01-01	91.150
2008-01-01	90.275
2009-01-01	87.750
2010-01-01	87.550
2011-01-01	87.250
2012-01-01	87.075
2013-01-01	88.225
2014-01-01	90.000
2015-01-01	90.850
2016-01-01	92.275
2017-01-01	91.300