Year	Percent
2000-01-01	91.775
2001-01-01	91.300
2002-01-01	91.300
2003-01-01	91.275
2004-01-01	90.975
2005-01-01	91.075
2006-01-01	91.675
2007-01-01	91.600
2008-01-01	91.650
2009-01-01	91.625
2010-01-01	91.425
2011-01-01	91.650
2012-01-01	92.000
2013-01-01	92.025
2014-01-01	92.225
2015-01-01	91.925
2016-01-01	92.175
2017-01-01	92.350