1997

8.2

2006

8.3

2025

6.8

1975

6.7

2023

9.4

2005

6.3

1994

7.6

1989

7.6

2000

7.8

2020

7.5

2011

6.1

2009

7.4

2020

6.8

2013

8.6

2006

6.4

1992

6.9

2012

6.2

1996

6.4

2020

8.1

2022

8.5