Year	Percent
2003-01-01	87.025
2004-01-01	86.825
2005-01-01	88.850
2006-01-01	88.700
2007-01-01	89.275
2008-01-01	88.400
2009-01-01	84.225
2010-01-01	83.225
2011-01-01	82.025
2012-01-01	83.150
2013-01-01	87.150
2014-01-01	88.725
2015-01-01	88.925
2016-01-01	89.675
2017-01-01	89.075