1968

6.5

1982

6.1

1968

6.3

1975

7.8

1978

5.6

1967

6.1

1974

5.5

1983

6.5

1978

5.5

1980

6.0

1978

6.0

1984

4.4

1973

6.0

1981

4.5

1985

5.1

1963

5.7

1970

6.3

1970

5.5

1974

7.0

1963

6.8

1967

5.6

1983

6.0

1976

5.5

1981

7.8

1976

7.5

1975

4.8

1967

6.1

1982

6.9

1974

2.5