Year	Percent
1981-01-01	2.0000
1982-01-01	2.0000
1983-01-01	2.0000
1984-01-01	1.0000
1985-01-01	2.5000
1986-01-01	2.5000
1987-01-01	4.5000
1988-01-01	5.2104
1989-01-01	7.3843
1990-01-01	10.8000
1991-01-01	9.6000
1992-01-01	5.7000
1993-01-01	6.0000
1994-01-01	6.5000
1995-01-01	4.6000
1996-01-01	5.6000
1997-01-01	4.3000
1998-01-01	3.1600
1999-01-01	2.7400