1979

6.0

1977

6.8

1981

5.0

1982

6.3

1978

6.4

1982

6.8

1992

5.6

2000

0.0

1983

6.6

1995

5.9

1982

6.0

1979

7.3

1984

4.9

1983

8.2

1983

7.5

1988

2.5

1984

3.5