1984

6.2

1975

7.3

1970

5.5

1980

6.4

1988

7.3

1978

6.7

1990

5.8

1976

0.0

1982

7.3

1984

6.7

1991

6.2

1981

6.6

1986

6.5

1977

7.2

1986

7.2

1985

6.5

1984

7.3

1990

5.2

1980

6.9

1984

7.4

1982

7.1

1991

7.8

1983

6.4

1982

5.4

1986

6.7

1972

7.4

1977

6.7

1968

3.8

1954

7.6

1987

0.0

1983

6.5