Year	Percent
1980-01-01	3.00000
1981-01-01	3.00000
1982-01-01	3.00000
1983-01-01	3.00000
1984-01-01	3.00000
1985-01-01	3.50000
1986-01-01	3.50000
1987-01-01	3.50000
1988-01-01	4.00000
1989-01-01	4.00000
1990-01-01	4.00000
1991-01-01	4.00000
1992-01-01	4.00000
1993-01-01	4.00000
1994-01-01	4.00000
1995-01-01	2.99000
1996-01-01	3.43000
1997-01-01	3.29000
1998-01-01	3.42000
1999-01-01	2.62000
2000-01-01	2.41000
2001-01-01	1.64461
2002-01-01	1.74232
2003-01-01	2.44000
2004-01-01	2.73000
2005-01-01	2.62000
2006-01-01	2.67000