1987

6.2

1996

8.0

1980

5.9

2018

6.7

1972

6.4

2012

7.1

1896

6.2

2017

4.8

2014

7.7

1947

7.1

2020

6.9

2018

7.4

2014

5.8

2018

6.7

2014

7.6

2010

6.5

2019

6.9

2012

6.3

1992

6.6

2007

6.6