1974

8.6

1990

7.4

2003

7.2

2006

7.2

1990

6.4

1939

6.0

1999

7.3

1973

7.5

2014

6.3

1946

7.4

2000

4.8

1975

7.5

2003

5.4

2022

6.2

1998

7.5

1991

6.8

1991

7.3

2020

7.4

2004

6.5

2005

6.7