Year	Percent
1980-01-01	6.50000
1981-01-01	6.50000
1982-01-01	6.50000
1983-01-01	6.50000
1984-01-01	6.50000
1985-01-01	4.83333
1986-01-01	5.41667
1987-01-01	6.00000
1988-01-01	6.00000
1989-01-01	5.00000
1990-01-01	5.00000
1991-01-01	5.00000
1992-01-01	8.31667
1993-01-01	8.95833
1994-01-01	9.16667
1995-01-01	11.33330
1996-01-01	13.00000
1997-01-01	13.00000
1998-01-01	16.50000
1999-01-01	19.00000
2000-01-01	16.16670
2001-01-01	14.50000
2002-01-01	13.00000
2003-01-01	13.00000
2004-01-01	13.00000
2005-01-01	15.08330
2006-01-01	16.00000
2007-01-01	15.50000
2008-01-01	12.33330
2009-01-01	11.50000
2010-01-01	9.00000
2011-01-01	9.00000
2012-01-01	11.19000