1989

8.1

1978

7.2

1985

6.4

1998

7.4

1994

7.1

1987

7.8

1987

6.5

1994

6.4

1997

7.5

1971

0.0

1976

0.0

1989

8.0

1968

0.0

1975

6.0

1990

7.0

1995

3.7

1973

9.0

1989

5.7

1988

10.0