Year	Percent
1980-01-01	2.6650000000000000
1981-01-01	1.6530000000000000
1982-01-01	1.9280000000000002
1983-01-01	3.0430000000000000
1984-01-01	2.4730000000000003
1985-01-01	2.4730000000000003
1986-01-01	2.4730000000000003
1987-01-01	2.4730000000000003
1988-01-01	2.4730000000000003
1989-01-01	2.4730000000000003
1990-01-01	2.4730000000000003
1991-01-01	2.4730000000000003
1992-01-01	2.4730000000000003
1993-01-01	2.4730000000000003
1994-01-01	2.4730000000000003
1995-01-01	2.4730000000000003
1996-01-01	2.4730000000000003
1997-01-01	2.4730000000000003
1998-01-01	2.4730000000000003
1999-01-01	4.9070000000000000
2000-01-01	3.5370000000000000
2001-01-01	4.4490000000000000