1971

4.0

1966

5.6

1920

7.3

1949

6.2

1993

5.4

5.3

1977

6.5

2007

5.7

2012

6.3

1911

6.6

1946

6.0

2018

6.6

2015

8.1

2014

8.0

2011

5.6

1991

7.0

1915

5.5

6.2

2015

5.1