1949

6.6

1953

5.2

1966

7.3

1962

6.1

1965

6.7

1962

6.3

1957

6.7

1959

6.7

1955

6.5

1950

7.5

1962

7.7

1955

6.1

1950

6.8

1959

5.8

1953

5.6

1957

5.9

1964

6.1

1967

6.1

1956

6.3