1960

5.9

1962

6.1

1973

5.7

1961

6.4

1959

6.2

1954

5.2

1971

6.4

1950

6.1

1948

6.8

1980

8.3

1973

6.1

1959

6.7

1957

6.0

1962

7.3

1960

5.6

1962

7.7

1979

6.7

1954

5.4

1956

3.7

1963

6.4

1960

7.1

1956

7.0

1952

6.0

1959

6.3

1957

5.7

1961

6.5

1984

7.1

1953

6.1

1945

6.2