1985

6.1

2020

6.4

2015

6.4

1968

6.9

6.8

2015

6.6

2003

7.3

2024

7.0

1943

6.4

2023

6.5

2014

6.2

7.0

2018

6.3

2009

6.7

2011

6.4

2021

6.7

2020

6.4

2017

8.2

2008

7.1

2019

6.3