Year	Percent
2000-01-01	74.500
2001-01-01	75.450
2002-01-01	75.550
2003-01-01	77.050
2004-01-01	77.750
2005-01-01	79.150
2006-01-01	84.075
2007-01-01	84.775
2008-01-01	83.875
2009-01-01	76.525
2010-01-01	74.900
2011-01-01	78.250
2012-01-01	79.450
2013-01-01	80.400
2014-01-01	80.850
2015-01-01	82.975
2016-01-01	82.575
2017-01-01	83.950