1992

8.6

1989

5.5

1998

6.3

2002

5.3

1991

0.0

1994

6.5

2000

8.5

1987

7.7

1984

7.3

1995

5.7

1997

6.3

1999

6.5

1992

6.0

1997

4.4

2003

6.8