1984

8.5

1985

7.9

1983

8.1

2008

8.9

2017

7.3

2004

9.5

2016

7.4

2019

7.1

2003

7.8

2006

7.6

2015

6.9

1992

7.0

2014

8.5

2017

7.4

2020

7.0

2015

7.8

2020

7.8

1976

7.9

2018

7.4

2022

8.4