1994

6.7

7.0

1993

7.1

1999

7.4

1990

5.9

1997

0.0

1987

7.2

1987

7.7

1978

4.3

2003

9.7

1980

6.0

1982

6.0

1977

2.0

1986

5.8

1977

6.3

1991

8.0