1970

6.4

1955

5.6

1958

6.6

1938

7.1

2009

6.2

2020

7.5

2009

6.6

1964

7.4

1984

7.2

2011

5.8

1964

7.1

1973

5.7

1989

7.3

1941

7.4

1991

6.7

1998

6.2

1956

6.2

2000

6.3

2016

6.5

2016

6.8