Year	Percent
2000-01-01	76.950
2001-01-01	77.250
2002-01-01	77.575
2003-01-01	77.050
2004-01-01	76.875
2005-01-01	76.675
2006-01-01	76.900
2007-01-01	77.375
2008-01-01	77.850
2009-01-01	77.875
2010-01-01	76.100
2011-01-01	75.200
2012-01-01	75.700
2013-01-01	75.700
2014-01-01	75.500
2015-01-01	75.325
2016-01-01	74.950
2017-01-01	74.850