Year	Percent
1995-01-01	65.1366842000000
1996-01-01	65.8112260300000
1997-01-01	66.0813288225000
1998-01-01	66.5493325575000
1999-01-01	66.6679939750000
2000-01-01	66.0696477700000
2001-01-01	66.7776458175000
2002-01-01	68.8001761750000
2003-01-01	68.6036899325000
2004-01-01	68.1737131500000
2005-01-01	67.6331312150000
2006-01-01	67.4441154475000
2007-01-01	67.6026749400000
2008-01-01	68.3652469250000
2009-01-01	68.6314835175000
2010-01-01	68.7395091525000
2011-01-01	69.9506845950000
2012-01-01	50.5000000000000
2013-01-01	50.3916666666667
2014-01-01	50.2750000000000
2015-01-01	51.0333333333333
2016-01-01	51.5166666666667
2017-01-01	51.7083333333333