Year	Percent
1982-01-01	1.44
1983-01-01	1.44
1984-01-01	1.44
1985-01-01	0.72
1986-01-01	0.72
1987-01-01	0.72
1988-01-01	0.36
1989-01-01	0.36
1990-01-01	0.72
1991-01-01	1.08
1992-01-01	1.08
1993-01-01	1.08
1994-01-01	1.08
1995-01-01	1.08
1996-01-01	2.61
1997-01-01	2.97
1998-01-01	2.61
1999-01-01	3.60
2000-01-01	3.60
2001-01-01	3.60
2002-01-01	3.33
2003-01-01	3.33
2004-01-01	3.33
2005-01-01	3.33
2006-01-01	3.60
2007-01-01	3.33
2008-01-01	3.06
2009-01-01	3.06
2010-01-01	3.06
2011-01-01	3.06
2012-01-01	3.00
2013-01-01	3.00
2014-01-01	2.85
2015-01-01	2.85
2016-01-01	2.85