1991

8.3

1994

8.7

2003

6.5

1984

8.4

2003

7.7

2005

7.0

1995

6.6

1996

8.0

1961

7.3

1963

7.0

1964

7.0

2007

7.5

2023

6.7

1999

6.8

1997

7.8

1999

6.4

1932

6.9

2019

7.0

2000

6.0

1990

7.0