1984

8.5

1990

7.6

2008

6.7

2004

7.8

2024

8.6

2001

6.5

1998

6.8

1980

8.2

2023

8.2

2021

7.9

2014

7.8

1979

7.4

2012

8.4

2011

7.8

1996

6.8

2020

7.7

2024

7.4

2023

8.1

2016

7.3

1977

7.4