Year	Percent
1995-01-01	62.8940263750000
1996-01-01	62.1347214625000
1997-01-01	61.5891310750000
1998-01-01	60.9575871625000
1999-01-01	60.7147678575000
2000-01-01	60.7481076175000
2001-01-01	60.6827637275000
2002-01-01	60.2006206750000
2003-01-01	60.1352085050000
2004-01-01	60.6037915950000
2005-01-01	60.6631203075000
2006-01-01	61.0752851375000
2007-01-01	61.7605140300000
2008-01-01	61.9717513975000
2009-01-01	61.7428907125000
2010-01-01	62.1612408000000
2011-01-01	62.3323506850000
2012-01-01	69.3083333333333
2013-01-01	69.4000000000000
2014-01-01	69.4416666666667
2015-01-01	69.2916666666666
2016-01-01	69.1000000000000
2017-01-01	68.9583333333333