1971

10.0

2010

6.6

1993

6.2

2016

6.6

2006

7.0

2020

9.8

1941

5.4

1955

7.4

2020

6.2

2010

6.5

2017

9.5

1980

6.2

8.0

2018

7.2

2006

5.7

1986

6.0

2013

6.3

2019

6.4

2024

5.7