7.5

2020

6.9

2010

6.6

2014

5.7

1968

6.9

2004

6.2

1976

7.0

2006

6.4

1938

6.7

2020

7.4

1957

7.2

2015

6.0

1999

5.8

1966

6.5

1989

8.1

1985

6.5

1988

6.2

1976

7.2

1972

7.7

1977

7.0