1981

6.3

1955

6.6

1957

7.4

1984

7.3

1954

6.1

1957

7.7

1976

8.6

1963

7.2

1967

6.3

1991

6.5

1972

5.7

1962

6.4

1957

6.4

1958

6.9

1975

0.0

1978

7.5