Year	Percent
1999-01-01	92.975
2000-01-01	93.150
2001-01-01	91.725
2002-01-01	92.025
2003-01-01	92.450
2004-01-01	92.450
2005-01-01	92.300
2006-01-01	92.475
2007-01-01	92.525
2008-01-01	92.475
2009-01-01	92.175
2010-01-01	92.425
2011-01-01	92.475
2012-01-01	92.575
2013-01-01	92.450
2014-01-01	92.550
2015-01-01	92.600
2016-01-01	92.475
2017-01-01	91.975