1955

4.5

1952

3.3

1967

6.2

1965

7.5

1971

5.0

1962

5.4

1957

5.3

1959

7.1

1974

0.0

1968

6.6

1958

4.3

1962

6.9

1964

6.3

1961

5.4

1963

6.9