2000

8.4

1993

8.5

0.0

2006

3.0

2003

9.6

1990

6.2

1997

8.3

1986

7.5

1997

5.6

1960

5.7

2006

7.1

2006

5.7

1989

6.9

1995

8.4

1996

7.0

2004

8.1

1995

7.8

2003

8.0

2005

7.9

1989

7.5