1965

7.1

1964

6.6

1959

3.2

1957

6.0

1966

6.4

1968

6.1

1964

7.3

1963

7.1

1957

7.2

1963

5.3

1961

6.2

1959

6.8

1960

7.1

1961

7.8

1960

3.8

1956

7.9

1955

7.4

1963

5.0

1959

7.7

1959

7.3

1960

6.8

1958

7.7

1967

6.6

1962

6.4

1966

6.0

1961

5.1

1966

4.5

1961

0.0