Year	Percent
2000-01-01	82.850
2001-01-01	82.625
2002-01-01	82.375
2003-01-01	82.425
2004-01-01	82.100
2005-01-01	82.075
2006-01-01	82.325
2007-01-01	82.200
2008-01-01	82.450
2009-01-01	81.975
2010-01-01	81.525
2011-01-01	81.500
2012-01-01	81.975
2013-01-01	82.100
2014-01-01	82.150
2015-01-01	82.175
2016-01-01	82.450
2017-01-01	82.350