1996

8.1

2023

8.2

2004

8.6

2022

8.5

2014

7.8

2017

7.9

2020

7.6

2016

8.0

2021

8.3

2017

8.2

1975

6.6

2022

7.6

2005

8.4

2006

8.1

2019

7.6

2017

7.8

2000

7.5

1965

7.8

1984

7.7