Year	Percent
2000-01-01	76.475
2001-01-01	76.250
2002-01-01	75.775
2003-01-01	75.750
2004-01-01	76.000
2005-01-01	76.425
2006-01-01	75.400
2007-01-01	75.600
2008-01-01	76.275
2009-01-01	77.450
2010-01-01	78.575
2011-01-01	78.675
2012-01-01	79.125
2013-01-01	79.100
2014-01-01	79.650
2015-01-01	79.575
2016-01-01	78.975
2017-01-01	78.750