1963

8.3

1956

7.5

2015

8.1

2008

6.5

2012

7.3

2020

5.9

1972

7.9

2011

5.2

2012

6.4

1968

7.4

1997

6.2

1964

7.2

1974

6.6

1996

5.7

1939

7.9

1935

7.3

1921

6.8

1943

7.5

2019

6.7

2011

9.1