1987

7.2

1990

7.4

1983

5.2

1978

7.0

1982

6.8

1979

5.0

1993

3.0

1982

4.9

1992

4.3

1980

6.5

1993

5.8

1989

2.9

1982

4.0

1983

4.2

1994

4.5

1987

8.0