1981

5.2

1980

6.2

1977

6.0

1984

6.9

1994

8.0

1985

0.0

1995

7.5

1978

7.0

1994

7.0

1982

9.0

1971

6.4

1985

0.0

1970

6.2

1998

7.5

1978

5.5

1998

0.0