Year	Percent
1980-01-01	8.31250
1981-01-01	8.25000
1982-01-01	8.25000
1983-01-01	7.00000
1984-01-01	7.25000
1985-01-01	7.25000
1986-01-01	7.41667
1987-01-01	8.25000
1988-01-01	8.33333
1989-01-01	8.70833
1990-01-01	9.00000
1991-01-01	9.00000
1992-01-01	9.00000
1993-01-01	9.00000
1994-01-01	9.00000
1995-01-01	9.00000
1996-01-01	9.00000
1997-01-01	9.00000
1998-01-01	9.00000
1999-01-01	9.00000
2000-01-01	9.00000
2001-01-01	9.00000
2002-01-01	9.00000
2003-01-01	9.00000
2004-01-01	9.00000
2005-01-01	2.60000
2006-01-01	3.66000
2007-01-01	3.13000
2008-01-01	3.26000
2009-01-01	1.43000
2010-01-01	1.71000
2011-01-01	1.84000
2012-01-01	1.25000
2013-01-01	1.17000
2014-01-01	0.80000
2015-01-01	0.90000