1977

7.4

2008

8.9

2019

8.7

2021

8.8

2011

8.3

2006

8.6

2005

8.6

2016

8.0

1999

7.9

2013

8.1

2020

8.5

1990

6.9

2022

8.4

2016

8.6

2018

8.1

2014

8.3

2015

8.0

2013

8.7

2015

8.7

2013

8.2