Year	Percent
1980-01-01	3.75
1981-01-01	4.25
1982-01-01	4.00
1983-01-01	5.00
1984-01-01	6.00
1985-01-01	5.00
1986-01-01	5.75
1987-01-01	4.50
1988-01-01	4.75
1989-01-01	5.00
1990-01-01	5.00
1991-01-01	6.25
1992-01-01	12.00
1993-01-01	6.50
1994-01-01	5.96
1995-01-01	5.75
1996-01-01	5.87
1997-01-01	6.25
1998-01-01	3.68
1999-01-01	3.90
2000-01-01	5.39
2001-01-01	3.83
2002-01-01	3.40
2003-01-01	2.62
2004-01-01	2.62
2005-01-01	2.83