Year	Percent
1960-01-01	5.00
1961-01-01	5.00
1962-01-01	5.00
1963-01-01	4.50
1964-01-01	4.50
1965-01-01	4.50
1966-01-01	4.50
1967-01-01	3.75
1968-01-01	3.75
1969-01-01	4.75
1970-01-01	5.00
1971-01-01	5.00
1972-01-01	5.50
1973-01-01	5.50
1974-01-01	6.50
1975-01-01	6.00
1976-01-01	4.00
1977-01-01	5.50
1978-01-01	4.50
1979-01-01	3.75
1980-01-01	6.75
1981-01-01	6.75
1982-01-01	4.81
1983-01-01	3.75
1984-01-01	4.50
1985-01-01	4.00
1986-01-01	4.00
1987-01-01	3.05
1988-01-01	4.00
1989-01-01	6.50
1990-01-01	6.50
1991-01-01	7.69
1992-01-01	8.00
1993-01-01	5.25
1994-01-01	4.50
1995-01-01	3.23
1996-01-01	2.50
1997-01-01	2.50
1998-01-01	2.50
1999-01-01	2.50
2000-01-01	4.25
2001-01-01	2.75
2002-01-01	2.38
2003-01-01	1.47
2004-01-01	1.47
2005-01-01	1.47
2006-01-01	2.67
2007-01-01	3.19
2008-01-01	2.10
2009-01-01	0.38
2010-01-01	0.38
2011-01-01	0.59
2012-01-01	0.38
2013-01-01	-0.12
2014-01-01	-0.12
2015-01-01	-0.12
2016-01-01	-0.62
2017-01-01	-0.62