1920

6.7

1992

6.3

1972

7.3

2006

7.2

2010

7.0

2017

5.9

2020

6.7

2009

6.2

1937

6.8

1981

6.7

2012

6.0

1923

8.5

2004

5.9

2011

5.7

1981

5.1

1989

5.9

2016

6.9

2023

5.0

1964

8.2