2015

3.8

2016

4.2

2017

4.9

2019

6.5

1896

5.2

2010

5.8

2021

7.0

2018

6.6

1955

7.2

2013

6.1

1974

6.1

2002

4.7

1972

7.0

2015

5.8

2000

5.7

1980

5.9

2006

6.8

2012

6.1

2004

6.7