Year	Percent
1989-01-01	90.97700000000000
1990-01-01	86.58190000000000
1991-01-01	83.88790000000000
1992-01-01	86.09420000000000
1993-01-01	86.19010000000000
1994-01-01	88.59700000000001
1995-01-01	92.94010000000000
1996-01-01	95.26260000000000
1997-01-01	95.57590000000000
1998-01-01	95.95690000000000
1999-01-01	96.10960000000000
2000-01-01	96.01820000000000
2001-01-01	95.45190000000000
2002-01-01	94.51810000000000
2003-01-01	93.25800000000000
2004-01-01	93.94030000000000
2005-01-01	95.07920000000000
2006-01-01	94.61890000000000
2007-01-01	95.06980000000000
2008-01-01	97.72420000000000
2009-01-01	97.72420000000000
2010-01-01	97.72420000000000
2011-01-01	97.72420000000000
2012-01-01	99.95340000000000
2013-01-01	99.92380000000000
2014-01-01	99.81290000000000
2015-01-01	99.62370000000000
2016-01-01	99.57330000000000