1981

0.0

1956

5.9

1961

4.4

1975

5.0

1967

5.0

1983

9.0

1957

5.7

1991

7.0

1979

7.5

1989

4.8

1968

6.9

1976

0.0

1973

0.0

1975

0.0

1981

4.0