1958

6.7

1968

7.0

1965

6.0

1961

6.2

1957

7.3

1968

6.7

1967

6.8

1975

1.0

1971

5.4

1966

5.4

1966

8.0

1963

5.7

1962

7.9

1971

7.0

1969

4.0

1966

0.0

1973

5.6

1964

7.5

1962

7.0

1964

6.2