Year	Percent
2003-01-01	91.600
2004-01-01	92.200
2005-01-01	92.800
2006-01-01	92.700
2007-01-01	92.200
2008-01-01	90.175
2009-01-01	90.825
2010-01-01	92.000
2011-01-01	90.825
2012-01-01	91.025
2013-01-01	90.075
2014-01-01	90.500
2015-01-01	89.275
2016-01-01	88.450
2017-01-01	87.375