1986

7.7

1988

6.3

1981

5.6

1979

4.0

1979

6.8

1975

0.0

1984

7.3

1973

7.1

1977

5.0

1973

6.7

1989

8.0

1974

7.0

1977

4.5

1985

5.0

1984

5.7

1976

4.0

1973

0.0

1978

6.8