Year	Percent
1983-01-01	14.00
1984-01-01	14.00
1985-01-01	13.00
1986-01-01	12.00
1987-01-01	10.50
1988-01-01	14.00
1989-01-01	17.00
1990-01-01	22.00
1991-01-01	22.00
1992-01-01	21.00
1993-01-01	22.00
1994-01-01	25.00
1995-01-01	28.00
1996-01-01	23.00
1997-01-01	20.50
1998-01-01	17.00
1999-01-01	14.50
2000-01-01	11.00
2001-01-01	9.75
2002-01-01	8.50
2003-01-01	12.50
2004-01-01	9.50
2005-01-01	6.00
2006-01-01	8.00
2007-01-01	7.50
2008-01-01	10.00
2009-01-01	6.25
2010-01-01	5.75
2011-01-01	7.00
2012-01-01	5.75
2013-01-01	3.00
2014-01-01	2.10
2015-01-01	1.35
2016-01-01	0.90
2017-01-01	0.90