1946

5.2

1955

6.8

1961

7.7

1982

7.5

1957

7.2

1962

6.7

1964

8.0

1978

7.8

1965

7.8

1963

7.2

1954

5.0

1958

4.3

1955

5.0

1951

6.8

1978

7.3

1968

7.7

1959

5.0

1952

7.4

1955

5.0

1959

8.0

1957

5.5

1967

7.8