Year	Percent
1980-01-01	10.00
1981-01-01	9.50
1982-01-01	9.50
1983-01-01	9.50
1984-01-01	9.00
1985-01-01	11.50
1986-01-01	12.00
1987-01-01	13.00
1988-01-01	13.50
1989-01-01	14.00
1990-01-01	14.00
1991-01-01	13.00
1992-01-01	12.50
1993-01-01	12.00
1994-01-01	12.50
1995-01-01	13.00
1996-01-01	13.00
1997-01-01	13.00
1998-01-01	11.50
1999-01-01	11.50
2000-01-01	11.50
2001-01-01	11.50
2002-01-01	9.00
2003-01-01	14.50
2004-01-01	14.50
2005-01-01	17.00
2006-01-01	18.00
2007-01-01	14.10
2008-01-01	11.50
2009-01-01	11.50
2010-01-01	15.00
2011-01-01	16.50
2012-01-01	16.50
2013-01-01	11.15
2014-01-01	14.45