2004

8.1

2000

7.6

1998

8.3

1987

7.8

1967

7.3

1984

8.1

0.0

2003

7.1

2006

6.3

2006

7.2

2006

7.0

2001

6.7

2020

6.9

2018

4.7

1994

6.8

2007

6.5

1966

8.2

1998

6.6

2004

7.2

2002

7.6