1960

5.2

1951

6.7

1964

6.5

1977

7.0

1965

6.6

1946

6.5

1965

7.5

1957

3.5

1968

6.2

1978

9.1

1967

4.8

1969

5.5

1968

6.0

1966

4.0

1962

6.3

1964

6.3

1957

5.4

1951

6.4

1970

8.0

1977

6.5

1981

6.9

1973

6.9

1970

4.8

1956

6.0