Year	Percent
2000-01-01	77.500
2001-01-01	77.175
2002-01-01	76.825
2003-01-01	75.500
2004-01-01	75.125
2005-01-01	74.825
2006-01-01	75.375
2007-01-01	76.825
2008-01-01	77.950
2009-01-01	76.425
2010-01-01	75.300
2011-01-01	75.300
2012-01-01	75.750
2013-01-01	75.425
2014-01-01	75.225
2015-01-01	74.800
2016-01-01	74.300
2017-01-01	74.000