Year	Percent
2000-01-01	76.100
2001-01-01	76.225
2002-01-01	76.450
2003-01-01	75.400
2004-01-01	75.100
2005-01-01	74.900
2006-01-01	74.775
2007-01-01	75.875
2008-01-01	77.225
2009-01-01	76.425
2010-01-01	75.525
2011-01-01	75.700
2012-01-01	75.825
2013-01-01	75.950
2014-01-01	75.900
2015-01-01	76.075
2016-01-01	75.850
2017-01-01	75.200