Year	Percent
1999-01-01	87.075
2000-01-01	87.450
2001-01-01	87.950
2002-01-01	88.125
2003-01-01	87.525
2004-01-01	88.600
2005-01-01	88.800
2006-01-01	89.050
2007-01-01	89.325
2008-01-01	90.100
2009-01-01	89.625
2010-01-01	89.975
2011-01-01	90.150
2012-01-01	90.775
2013-01-01	90.700
2014-01-01	90.350
2015-01-01	90.825
2016-01-01	90.475
2017-01-01	91.825