1977

6.3

1976

4.9

1985

6.4

1984

6.4

1984

8.0

1969

6.6

1990

0.0

1981

7.9

1970

6.7

1976

3.4

1979

6.2

1961

0.0

1964

0.0

1977

7.4

1962

7.3

1975

7.7