Year	Percent
1995-01-01	68.9586732250000
1996-01-01	68.2270738900000
1997-01-01	67.7855669750000
1998-01-01	67.3370634000000
1999-01-01	67.0488841125000
2000-01-01	67.0860851325000
2001-01-01	66.9033958800000
2002-01-01	66.3151875275000
2003-01-01	66.3241454425000
2004-01-01	66.8173461425000
2005-01-01	66.7900836650000
2006-01-01	67.2327075800000
2007-01-01	67.9766567800000
2008-01-01	68.0521753000000
2009-01-01	67.7696626100000
2010-01-01	68.1505570225000
2011-01-01	68.2432017400000
2012-01-01	75.8833333333334
2013-01-01	75.9583333333333
2014-01-01	76.0666666666667
2015-01-01	76.1083333333333
2016-01-01	75.6500000000000
2017-01-01	75.6250000000000