1998

8.2

2000

8.0

2004

7.9

1994

7.8

1993

7.7

1994

8.4

2004

8.6

1995

7.3

2004

6.3

2000

8.5

1992

5.9

2006

0.0

1990

7.9

2001

6.8

1996

7.8

1989

8.3

1999

7.0

2001

6.5

2005

7.2

1998

6.9

1997

5.2