1997

8.1

1980

5.0

1992

6.8

1993

7.6

1988

5.0

1978

0.0

1968

7.1

1977

5.8

1979

6.7

2003

7.5

1989

8.3

1977

6.3

1979

7.2

1984

6.0

1975

7.0