1972

6.8

1977

6.8

1982

0.0

1974

7.9

1990

6.4

1981

0.0

1983

4.3

1986

7.2

1980

6.9

1993

6.9

1983

5.7

1956

6.0

1991

7.3

1975

7.3

1988

5.3

1987

6.3

1974

6.4