Year	Percent
1980-01-01	4.75
1981-01-01	5.50
1982-01-01	4.25
1983-01-01	4.75
1984-01-01	5.50
1985-01-01	4.60
1986-01-01	5.10
1987-01-01	5.10
1988-01-01	4.75
1989-01-01	6.50
1990-01-01	5.75
1991-01-01	5.85
1992-01-01	5.50
1993-01-01	3.65
1994-01-01	3.75
1995-01-01	3.00
1996-01-01	2.80
1997-01-01	3.05
1998-01-01	3.55
1999-01-01	4.05
2000-01-01	4.10
2001-01-01	3.60
2002-01-01	3.60
2003-01-01	4.35
2004-01-01	4.35