Year	Percent
1980-01-01	8.10000
1981-01-01	10.00000
1982-01-01	8.01667
1983-01-01	10.44170
1984-01-01	10.81670
1985-01-01	10.00170
1986-01-01	7.20000
1987-01-01	7.75000
1988-01-01	7.92500
1989-01-01	7.05000
1990-01-01	7.05000
1991-01-01	7.05000
1992-01-01	7.05000
1993-01-01	7.05000
1994-01-01	8.18333
1995-01-01	9.20000
1996-01-01	9.20000
1997-01-01	10.40000
1998-01-01	15.51920
1999-01-01	10.46750
2000-01-01	14.34580
2001-01-01	16.19670
2002-01-01	13.95920
2003-01-01	11.77000
2004-01-01	14.25560
2005-01-01	13.60000
2006-01-01	12.05830
2007-01-01	11.27760
2008-01-01	10.40220
2009-01-01	10.07830
2010-01-01	10.70080
2011-01-01	10.71750
2012-01-01	10.01830
2013-01-01	9.61769
2014-01-01	9.34083
2015-01-01	9.55583
2016-01-01	9.74167