1988

8.0

2004

8.1

1975

8.3

2015

7.5

1984

7.3

1996

7.6

2018

7.7

2020

7.0

2019

7.9

2020

7.0

1962

7.3

1999

6.5

2009

7.4

2011

6.1

1992

6.7

1983

7.7

2024

6.9

2025

7.9

2022

6.9

2001

7.8