2001

7.1

2012

5.4

2005

6.4

2008

9.2

2009

8.7

1986

7.9

2019

8.1

2020

7.2

2017

7.6

1978

7.6

1972

8.7

2019

8.5

2023

7.6

2023

7.6

2019

8.2

2014

7.9

2023

8.3

2018

7.6

2022

7.4

2016

7.0