Year	Percent
1995-01-01	82.2335160900000
1996-01-01	81.0845016900000
1997-01-01	79.8732227425000
1998-01-01	78.9413870350000
1999-01-01	77.8307456625000
2000-01-01	78.0883791475000
2001-01-01	77.0777447800000
2002-01-01	75.7272807550000
2003-01-01	75.7618511050000
2004-01-01	76.2616083450000
2005-01-01	76.5241110125000
2006-01-01	77.4086786050000
2007-01-01	78.9414912875000
2008-01-01	79.6387409500000
2009-01-01	77.5448042475000
2010-01-01	78.6099592800000
2011-01-01	79.4883449500000
2012-01-01	81.6000000000000
2013-01-01	81.7416666666667
2014-01-01	82.2166666666667
2015-01-01	83.3666666666666
2016-01-01	83.4166666666667
2017-01-01	83.7916666666667