1996

6.4

1990

7.4

1997

8.1

2006

5.3

1996

6.1

1995

5.8

0.0

1987

7.7

1998

5.0

1996

7.8

1993

5.7

1997

0.0

1991

7.7

2001

5.8

2001

0.0

1997

5.3

1995

7.1