1960

5.6

1969

7.1

1951

6.9

1971

6.2

1965

6.3

1959

6.7

1962

7.3

1955

6.1

1964

5.5

1953

4.9

1965

7.6

1956

7.0

1958

6.5

1956

6.3

1958

7.0

1972

6.2