Year	Percent
2000-01-01	77.825
2001-01-01	78.000
2002-01-01	77.700
2003-01-01	77.825
2004-01-01	77.925
2005-01-01	77.825
2006-01-01	77.550
2007-01-01	77.600
2008-01-01	77.350
2009-01-01	74.900
2010-01-01	74.425
2011-01-01	74.300
2012-01-01	75.000
2013-01-01	75.375
2014-01-01	76.825
2015-01-01	77.575
2016-01-01	78.250
2017-01-01	78.600