1976

4.3

1959

7.5

1974

6.8

1981

5.5

1955

6.6

1973

7.2

1967

6.8

1974

8.0

1962

6.6

1966

7.6

1961

6.8

1960

6.4

1970

7.8

1974

7.1

1963

5.8

1977

6.0

1979

7.0

1982

5.0

1963

7.8

1968

5.2

1971

4.5

1958

7.0

1981

4.0

1962

6.3

1965

7.5