1994

4.9

2011

5.7

2016

6.9

2015

6.4

2020

6.0

1988

5.9

2006

6.3

2014

7.1

2011

6.8

2017

5.7

2022

3.0

1978

6.1

2023

10.0

1997

7.1

2008

6.8

2003

6.6

8.1