Year	Percent
1996-01-01	86.81700000000001
1997-01-01	87.95280000000000
1998-01-01	84.91580000000000
1999-01-01	78.56450000000000
2000-01-01	79.64750000000000
2001-01-01	80.85760000000000
2002-01-01	79.23100000000001
2003-01-01	79.92730000000000
2004-01-01	79.82180000000000
2005-01-01	77.07450000000000
2006-01-01	75.24900000000000
2007-01-01	73.67150000000000
2008-01-01	72.75930000000000
2009-01-01	74.93570000000000
2010-01-01	73.18430000000000
2011-01-01	70.98630000000000
2012-01-01	68.24350000000000
2013-01-01	67.80290000000000
2014-01-01	66.69970000000000
2015-01-01	65.82130000000000
2016-01-01	64.77550000000000