Year	Percent
1980-01-01	6.50000
1981-01-01	6.50000
1982-01-01	6.50000
1983-01-01	6.50000
1984-01-01	6.50000
1985-01-01	6.50000
1986-01-01	6.50000
1987-01-01	6.50000
1988-01-01	6.50000
1989-01-01	6.50000
1990-01-01	6.50000
1991-01-01	6.50000
1992-01-01	6.50000
1993-01-01	6.50000
1994-01-01	7.50000
1995-01-01	6.75000
1996-01-01	4.00000
1997-01-01	4.00000
1998-01-01	4.00000
1999-01-01	5.12500
2000-01-01	5.50000
2001-01-01	5.50000
2002-01-01	5.50000
2003-01-01	5.50000
2004-01-01	5.50000
2005-01-01	5.50000
2006-01-01	4.70833
2007-01-01	5.00000
2008-01-01	5.00000
2009-01-01	5.00000
2010-01-01	5.00000
2011-01-01	5.00000
2012-01-01	5.00000
2013-01-01	5.00000
2014-01-01	5.00000
2015-01-01	5.00000
2016-01-01	5.00000