Year	Percent
1980-01-01	4.50000
1981-01-01	4.50000
1982-01-01	4.50000
1983-01-01	4.50000
1984-01-01	4.50000
1985-01-01	3.75000
1986-01-01	3.39583
1987-01-01	3.33333
1988-01-01	3.97917
1989-01-01	4.50000
1990-01-01	6.68750
1991-01-01	10.64580
1992-01-01	10.27080
1993-01-01	9.70833
1994-01-01	9.41667
1995-01-01	10.50000
1996-01-01	16.54170
1997-01-01	17.00000
1998-01-01	17.00000
1999-01-01	17.00000
2000-01-01	17.00000
2001-01-01	15.66670
2002-01-01	13.00000
2003-01-01	13.00000
2004-01-01	13.00000
2005-01-01	12.75000
2006-01-01	11.00000
2007-01-01	10.75000