1977

8.1

2017

7.7

2008

7.2

2004

7.6

2019

7.6

1994

6.8

1992

7.9

2019

8.7

2019

7.1

1976

7.4

1984

8.5

2023

8.0

2024

7.2

2001

6.3

2019

7.0

2016

8.0

2021

9.9

1987

5.5

1979

7.5

2011

8.1