2006

6.1

2005

8.8

2000

6.2

1993

8.0

1999

7.7

1999

7.1

6.7

1993

0.0

2004

8.3

1995

7.7

1994

8.3

1990

6.0

2002

7.5

1988

5.7

1996

9.7

1992

5.4

2002

7.3

1987

7.3

2010

0.0

2020

0.0