1981

5.7

1965

6.4

2013

6.1

6.8

2019

7.7

2010

6.2

1972

6.6

2023

6.1

2022

7.4

6.5

5.0

1966

6.5

2021

6.3

2024

6.9

2020

7.3

2015

6.4

2023

7.0

2017

7.1