1991

4.5

1986

3.9

1983

5.6

1984

9.0

1993

7.2

1992

0.0

1988

5.6

1991

6.5

1987

0.0

2005

6.5

1976

6.6

1982

4.0

1996

6.7

1980

5.8

1997

4.9

1975

3.5

1998

4.6

1987

5.2

1992

5.3

1999

6.4

1978

0.0

1978

0.0

1995

6.0

1986

5.4