1987

7.2

1990

7.3

1983

5.2

1978

7.1

1982

6.8

1979

5.0

1993

2.7

1982

4.7

1992

3.9

1980

6.5

1993

5.8

1989

2.8

1982

4.0

1983

4.2

1994

4.4

1987

8.0