1990

8.5

1996

9.7

1979

8.2

1977

6.8

1995

7.7

1982

8.8

1980

8.8

1986

9.2

1996

9.7

0.0

1977

8.6

1994

6.8

1995

6.5

1989

7.9

1974

6.0

1981

6.3

1976

5.5

1982

7.9

1983

8.1

1993

7.8

1987

6.6

1974

5.6

1974

7.0

1990

6.8