Year	Percent
1995-01-01	75.3976560800000
1996-01-01	75.1418746350000
1997-01-01	75.1760226875000
1998-01-01	75.3778713650000
1999-01-01	75.8639038125000
2000-01-01	76.1353684225000
2001-01-01	75.7928539750000
2002-01-01	76.0949149825000
2003-01-01	76.4792905575000
2004-01-01	76.6863230425000
2005-01-01	76.6332142100000
2006-01-01	76.9069968575000
2007-01-01	77.8098636750000
2008-01-01	78.0960636875000
2009-01-01	78.2286446925000
2010-01-01	78.6848721425000
2011-01-01	78.8409927653967
2012-01-01	81.8083333333334
2013-01-01	81.7000000000000
2014-01-01	82.5416666666666
2015-01-01	82.6000000000000
2016-01-01	82.6583333333333
2017-01-01	82.8083333333334