1963

6.4

1965

7.0

1962

7.3

1968

6.8

1962

6.6

1955

4.8

1959

10.0

1965

6.8

1956

6.5

1954

8.5

1958

5.8

1960

6.6

1957

6.4

1957

7.9

1966

8.2

1962

6.5

1964

7.5