1970

7.6

6.7

2017

7.3

2020

6.7

2022

6.0

1967

6.6

2021

6.1

2006

6.4

1976

5.2

2016

6.8

1959

4.2

2022

7.0

2022

6.9

2023

6.4

2020

6.4

2008

7.0

2023

6.1

2023

5.8

2014

7.3