Year	Percent
1991-01-01	93.91530000000000
1992-01-01	95.31140000000000
1993-01-01	96.60330000000000
1994-01-01	97.18040000000000
1995-01-01	98.11070000000000
1996-01-01	98.46970000000000
1997-01-01	98.63270000000000
1998-01-01	98.82640000000000
1999-01-01	98.99799999999999
2000-01-01	99.10160000000000
2001-01-01	99.37330000000000
2002-01-01	99.62330000000000
2003-01-01	99.38530000000000
2004-01-01	99.24250000000000
2005-01-01	99.46440000000000
2006-01-01	99.64770000000000
2007-01-01	99.72220000000000
2008-01-01	99.76860000000000
2009-01-01	99.65030000000000
2010-01-01	99.56470000000000
2011-01-01	99.65460000000000
2012-01-01	99.53630000000000
2013-01-01	99.30520000000000
2014-01-01	99.17120000000000
2015-01-01	95.61450000000000
2016-01-01	88.58740000000000