1982

6.0

1991

4.7

1988

0.0

1994

4.6

1990

6.2

1987

8.0

1992

0.0

1992

4.8

1983

5.7

1983

3.7

1975

0.0

1987

1.0

1984

5.6

1993

3.0

1995

0.0