1990

6.9

2001

6.2

1997

2.0

2017

10.0

2016

9.0

2020

7.0

1977

4.6

2021

8.0

2024

6.0

2019

8.3

2018

6.0

2012

6.0

2008

7.5

2005

10.0

2018

6.0

2015

7.7