Year	Percent
1985-01-01	99.5059
1986-01-01	99.0331
1987-01-01	99.0354
1988-01-01	99.0585
1989-01-01	99.1542
1990-01-01	99.2162
1991-01-01	99.2567
1992-01-01	99.3757
1993-01-01	99.3757
1994-01-01	98.9072
1995-01-01	99.0514
1996-01-01	99.1703
1997-01-01	99.2196
1998-01-01	99.2196
1999-01-01	99.2196
2000-01-01	99.2196
2001-01-01	99.2196
2002-01-01	99.2196
2003-01-01	99.6666
2004-01-01	99.9242
2005-01-01	99.9242
2006-01-01	99.9242
2007-01-01	99.9242
2008-01-01	99.9242
2009-01-01	99.9724
2010-01-01	99.9114
2011-01-01	99.9150
2012-01-01	99.7294
2013-01-01	99.7582
2014-01-01	99.7582
2015-01-01	99.0300
2016-01-01	97.8852