2005

8.3

2015

5.2

2012

7.7

2021

6.3

2017

5.9

2020

5.9

2019

6.2

2020

7.9

2014

4.8

2011

7.0

2020

7.4

2023

9.4

2018

7.1

2013

8.5

1997

6.2

2010

5.5

2025

5.5

2020

6.3

1973

7.9