Year	Percent
1981-01-01	3.25000
1982-01-01	1.50000
1983-01-01	3.25000
1984-01-01	2.75000
1985-01-01	4.50000
1986-01-01	5.00000
1987-01-01	4.50000
1988-01-01	5.00000
1989-01-01	5.25000
1990-01-01	5.50000
1991-01-01	5.37500
1992-01-01	8.50000
1993-01-01	8.25000
1994-01-01	9.00000
1995-01-01	9.00000
1996-01-01	11.00000
1997-01-01	11.25000
1998-01-01	10.87000
1999-01-01	9.50000
2000-01-01	12.75000
2001-01-01	11.50000
2002-01-01	12.50000
2003-01-01	11.25000
2004-01-01	14.75000
2005-01-01	12.25000
2006-01-01	9.45000
2007-01-01	11.75000
2008-01-01	1.43333
2009-01-01	0.65000
2010-01-01	0.15000
2011-01-01	2.25000
2012-01-01	2.35000
2013-01-01	1.95000
2014-01-01	0.03000
2015-01-01	2.70000
2016-01-01	3.70000