Year	Percent
1995-01-01	65.4229368400000
1996-01-01	64.6719769775000
1997-01-01	64.1791162550000
1998-01-01	63.7420773650000
1999-01-01	63.4869487975000
2000-01-01	63.7053414975000
2001-01-01	63.6175065750000
2002-01-01	63.1458102325000
2003-01-01	63.0709786375000
2004-01-01	63.5304667375000
2005-01-01	63.6270217800000
2006-01-01	64.1651856425000
2007-01-01	64.8716687250000
2008-01-01	65.1994861425000
2009-01-01	64.9663049875000
2010-01-01	65.4527543300000
2011-01-01	65.5438048725000
2012-01-01	72.8750000000000
2013-01-01	72.9916666666667
2014-01-01	73.0916666666667
2015-01-01	73.0500000000000
2016-01-01	72.7500000000000
2017-01-01	72.6166666666666