Year	Percent
1981-01-01	6.2500000000000000
1982-01-01	6.7500000000000000
1983-01-01	8.0625000000000000
1984-01-01	8.0841700000000000
1985-01-01	8.4141700000000000
1986-01-01	9.1941700000000000
1987-01-01	9.9375000000000000
1988-01-01	10.1042000000000000
1989-01-01	10.4167000000000000
1990-01-01	10.3333000000000000
1991-01-01	11.0000000000000000
1992-01-01	11.5600000000000000
1993-01-01	11.0000000000000000
1994-01-01	10.9417000000000000
1995-01-01	7.5000000000000000
1996-01-01	6.0000000000000000
1997-01-01	6.7708300000000000
1998-01-01	7.6666700000000000
1999-01-01	8.6875000000000000
2000-01-01	8.5833300000000000
2001-01-01	7.5625000000000000
2002-01-01	6.4083300000000000
2003-01-01	4.6916699999999990
2004-01-01	5.9000000000000000
2005-01-01	5.4666700000000000
2006-01-01	6.3125000000000000
2007-01-01	6.8483300000000010
2008-01-01	4.0416700000000000
2009-01-01	4.2500000000000000
2010-01-01	3.9166700000000000
2011-01-01	4.0000000000000000
2012-01-01	4.7375000000000000
2013-01-01	3.7500000000000000
2014-01-01	3.5875000000000000
2015-01-01	2.2083300000000000
2016-01-01	1.7833299999999999