2000

6.3

2013

5.5

2006

7.4

2019

8.1

2018

6.8

1981

7.3

2021

7.8

2023

8.1

2009

7.0

1996

7.4

2022

7.8

2019

7.8

2007

7.8

2011

6.9

2016

7.9

2000

8.2

1994

8.5

2015

7.6

2004

7.4

2020

7.7