Year	Percent
1960-01-01	5.00
1961-01-01	5.00
1962-01-01	4.00
1963-01-01	4.00
1964-01-01	5.00
1965-01-01	5.50
1966-01-01	6.00
1967-01-01	6.00
1968-01-01	5.00
1969-01-01	7.00
1970-01-01	7.00
1971-01-01	5.00
1972-01-01	5.00
1973-01-01	5.00
1974-01-01	7.00
1975-01-01	6.00
1976-01-01	8.00
1977-01-01	8.00
1978-01-01	6.50
1979-01-01	9.00
1980-01-01	10.00
1981-01-01	11.00
1982-01-01	10.00
1983-01-01	8.50
1984-01-01	9.50
1985-01-01	10.50
1986-01-01	7.50
1987-01-01	7.50
1988-01-01	8.50
1989-01-01	10.50
1990-01-01	11.50
1991-01-01	8.00
1992-01-01	10.00
1993-01-01	5.00
1994-01-01	7.00
1995-01-01	7.00
1996-01-01	3.50
1997-01-01	2.50
1998-01-01	2.00
1999-01-01	1.50
2000-01-01	2.00
2001-01-01	2.00
2002-01-01	4.50
2003-01-01	2.85
2004-01-01	2.10
2005-01-01	1.60
2006-01-01	2.93
2007-01-01	4.10
2008-01-01	2.78
2009-01-01	0.35
2010-01-01	1.10
2011-01-01	2.02
2012-01-01	1.28
2013-01-01	1.02
2014-01-01	0.10
2015-01-01	-0.25
2016-01-01	-0.40
2017-01-01	-0.40