1987

8.0

2019

6.7

2023

7.0

2015

7.5

2017

7.3

2020

6.1

2012

7.8

1977

6.5

2006

6.6

2011

6.1

2008

6.6

2015

7.3

2018

5.9

2000

7.3

2010

5.5

2003

6.2

1999

7.4

2022

5.9

2007

6.5

2009

7.4