1989

8.4

1999

9.1

2005

8.7

1992

5.8

2019

5.8

4.4

2018

3.1

2005

8.9

2003

6.4

2002

4.0

2021

8.2

2008

10.0

2006

8.0

2020

8.0

2015

8.0