2000

9.4

2014

6.6

2010

5.5

2018

6.5

2006

6.1

1980

5.5

1997

6.3

2016

6.2

2016

9.7

2021

7.5

2008

7.4

2020

10.0

2023

7.8

1972

6.0

1994

6.8

1981

7.7

2002

4.6

1996

5.2

2025

0.0