1971

6.2

2017

6.5

2011

6.5

2016

6.4

2010

5.0

2023

5.9

2020

5.5

2002

4.5

2018

7.3

1970

7.7

2007

4.9

2015

7.7

2018

6.9

2017

7.4

2004

4.7

1927

7.8

2017

5.8

2021

6.3

2009

4.8

1903

6.0