Year	Percent
1980-01-01	1.87500
1981-01-01	1.50000
1982-01-01	1.50000
1983-01-01	1.50000
1984-01-01	1.50000
1985-01-01	1.50000
1986-01-01	1.50000
1987-01-01	1.50000
1988-01-01	1.50000
1989-01-01	1.50000
1990-01-01	1.50000
1991-01-01	1.50000
1992-01-01	1.50000
1993-01-01	1.50000
1994-01-01	1.50000
1995-01-01	1.50000
1996-01-01	1.50000
1997-01-01	1.50000
1998-01-01	1.50000
1999-01-01	3.79167
2000-01-01	4.00000
2001-01-01	4.00000
2002-01-01	4.00000
2003-01-01	4.00000
2004-01-01	4.00000
2005-01-01	4.00000
2006-01-01	3.83333
2007-01-01	3.50000
2008-01-01	3.50000
2009-01-01	3.50000
2010-01-01	3.50000
2011-01-01	3.50000
2012-01-01	3.50000
2013-01-01	3.50000
2014-01-01	3.50000