1981

6.3

1998

5.8

1979

3.5

1993

4.3

1987

3.2

1996

2.0

1982

0.0

1984

4.7

1996

1.6

1975

0.0

1988

3.7

1980

7.3

1993

5.8

1971

5.5

1992

6.7

1977

7.3

1970

0.0