1981

6.3

1998

5.5

1993

4.5

1987

3.6

1996

2.0

1982

0.0

1984

5.0

1996

2.0

1975

0.0

1988

4.3

1993

5.5

1971

5.5

1992

6.6

1977

7.2

1970

0.0