1973

8.0

2012

8.3

2021

8.2

2011

6.3

2011

6.4

2020

6.9

2018

7.6

1989

8.3

2003

7.2

1976

7.0

1951

7.9

2020

7.3

1998

7.0

2006

8.1

2023

7.7

2002

8.2

2003

7.6

2020

7.8

1993

7.3

1984

7.4