Year	Percent
1995-01-01	71.2380027400000
1996-01-01	70.9609631575000
1997-01-01	70.2265264475000
1998-01-01	69.9598675175000
1999-01-01	70.0064489175000
2000-01-01	70.4390442700000
2001-01-01	69.6315598675000
2002-01-01	69.1786981275000
2003-01-01	69.2661923450000
2004-01-01	69.7004788700000
2005-01-01	70.6108444300000
2006-01-01	71.4659124500000
2007-01-01	72.9721908250000
2008-01-01	73.9029353775000
2009-01-01	72.8025931800000
2010-01-01	73.9365432825000
2011-01-01	74.8267166000000
2012-01-01	76.8083333333334
2013-01-01	77.0583333333334
2014-01-01	78.2250000000000
2015-01-01	78.7333333333334
2016-01-01	79.1916666666666
2017-01-01	79.7083333333333