1971

7.6

1984

8.3

1983

6.5

1977

0.0

1986

6.0

1988

8.0

1969

5.2

1983

5.8

1987

6.0

1989

3.6

1979

3.3

1990

6.1

1992

3.5

1983

7.0

1990

1.0

1982

7.0

1983

7.0