1956

6.3

1964

6.7

1961

7.0

1958

6.5

1974

7.5

1959

7.0

1940

0.0

1960

7.6

1954

6.9

1952

5.7

1962

7.8

1968

6.4

1965

7.1

1969

7.6

1959

6.1