1981

6.7

1991

7.0

1979

5.4

1985

6.8

1983

0.0

1975

4.3

1977

0.0

1978

5.7

1983

6.0

1980

5.4

1998

0.8

1988

8.0

1985

2.5

2014

4.6

1980

6.0

1986

0.0

1983

6.7

1986

7.5

1984

1.0

1983

7.0