1955

5.4

1962

5.8

1972

6.2

1950

7.1

1968

6.8

1958

6.8

1952

6.3

1957

6.3

1966

5.9

1948

6.7

1971

6.6

1948

6.1

1947

6.5

1953

5.6

1965

7.1

1954

6.9

1970

5.0

1947

6.6

1958

6.8

1963

6.8

1965

4.3