Year	Percent
1995-01-01	61.7680179825000
1996-01-01	60.9003796925000
1997-01-01	59.7809149625000
1998-01-01	58.6181059300000
1999-01-01	58.0813210875000
2000-01-01	58.3047746425000
2001-01-01	57.9315615750000
2002-01-01	56.7723159900000
2003-01-01	56.6134072150000
2004-01-01	57.4608455200000
2005-01-01	58.1716147275000
2006-01-01	59.0831234800000
2007-01-01	60.4602151425000
2008-01-01	61.4402939875000
2009-01-01	60.0381753275000
2010-01-01	61.0022194100000
2011-01-01	61.8573338250000
2012-01-01	67.9333333333333
2013-01-01	68.4416666666667
2014-01-01	68.7916666666667
2015-01-01	69.2666666666667
2016-01-01	69.3333333333333
2017-01-01	69.6000000000000