1991

8.3

1996

7.8

1991

7.5

2002

7.0

2005

7.1

2003

6.0

1996

7.2

1998

6.8

2000

5.5

1994

7.5

1995

5.7

1993

7.8

2016

4.5

2007

7.9

1984

6.7

2003

5.8

1995

6.5

2023

0.0

1967

7.8

2006

6.8