1979

4.7

1981

7.0

1982

4.0

1980

4.3

1973

2.5

1974

8.0

1975

2.3

1986

6.5

1978

7.0

1976

4.9

1989

6.0

1980

3.0

1979

0.0

2001

3.5

1974

4.7

1975

0.0

1978

7.0

1981

3.0

1978

0.0

1982

0.0

1974

4.2