Year	Percent
1980-01-01	0.35123800000000000
1981-01-01	0.34084400000000000
1982-01-01	0.39668400000000004
1983-01-01	0.42101000000000005
1984-01-01	0.43172700000000000
1985-01-01	0.30660400000000000
1986-01-01	0.40369600000000000
1987-01-01	0.42233200000000000
1988-01-01	0.42233200000000000
1989-01-01	0.42233200000000000
1990-01-01	0.42233200000000000
1991-01-01	0.42233200000000000
1992-01-01	0.42233200000000000
1993-01-01	0.07727800000000000
1994-01-01	0.22991599999999998
1995-01-01	0.32388700000000000
1996-01-01	1.02587000000000000
1997-01-01	1.05418000000000000
1998-01-01	0.44307799999999997
1999-01-01	0.49302799999999997
2000-01-01	0.54546400000000010
2001-01-01	0.45919799999999994