1988

0.0

1972

6.3

1980

5.8

1988

7.6

1984

7.5

1987

6.5

1993

5.0

1986

7.0

1974

6.2

1977

7.7

1965

0.0

1978

8.0

1991

6.7

1975

7.2

1995

7.4