Year	Percent
2000-01-01	81.650
2001-01-01	82.775
2002-01-01	82.825
2003-01-01	82.575
2004-01-01	82.525
2005-01-01	82.925
2006-01-01	84.225
2007-01-01	85.450
2008-01-01	86.775
2009-01-01	86.325
2010-01-01	84.675
2011-01-01	83.975
2012-01-01	83.575
2013-01-01	82.150
2014-01-01	81.700
2015-01-01	82.225
2016-01-01	82.925
2017-01-01	83.450