1993

5.5

2020

6.0

2009

5.1

2014

6.3

2017

6.4

1993

7.5

1977

5.9

2010

5.5

2006

8.1

2018

7.0

2022

6.9

2022

7.3

2012

6.5

6.8

1991

6.0

2016

7.5

1985

5.9

2019

6.4