1997

0.0

1985

7.7

1993

6.1

1990

0.0

1984

5.0

1996

7.8

1989

0.0

1987

0.0

1991

4.0

1977

0.0

1985

0.0

1987

6.7

1992

3.1

1991

0.0

1989

6.2

1993

0.0