1975

7.5

1993

5.7

1996

3.7

1995

5.0

1962

5.2

1979

5.8

1986

8.0

1983

5.0

1991

0.0

1977

6.5

1980

7.0

1983

7.0

1993

6.8

1977

6.9

1984

8.0

1977

6.7

2003

7.1