1994

5.7

1990

6.5

2000

7.8

1987

6.4

1992

5.3

1994

6.0

1985

7.5

1997

6.6

1989

0.0

1988

6.8

1989

8.3

1998

7.4

1999

6.0

2002

4.1

1993

6.7

1993

6.0

1988

3.2