Year	Percent
1980-01-01	2.00000
1981-01-01	2.00000
1982-01-01	4.50000
1983-01-01	4.50000
1984-01-01	4.50000
1985-01-01	4.50000
1986-01-01	2.50000
1987-01-01	2.50000
1988-01-01	2.50000
1989-01-01	2.50000
1990-01-01	2.50000
1991-01-01	2.50000
1992-01-01	2.50000
1993-01-01	2.50000
1994-01-01	2.50000
1995-01-01	2.50000
1996-01-01	3.50000
1997-01-01	6.00000
1998-01-01	5.50000
1999-01-01	4.50000
2000-01-01	3.50000
2001-01-01	2.50000
2002-01-01	3.14583
2003-01-01	4.41667
2004-01-01	6.00000
2005-01-01	5.75000
2006-01-01	5.75000
2007-01-01	5.75000
2008-01-01	5.50000
2009-01-01	5.50000
2010-01-01	3.25000