1987

7.1

1990

7.4

1983

5.3

1978

7.0

1982

6.8

1979

5.0

1993

3.4

1982

5.1

1992

4.8

1980

6.5

1993

5.5

1989

3.0

1982

4.0

1983

5.0

1994

4.4

1987

8.0