1975

6.0

1997

7.8

2012

6.7

1989

7.3

2014

6.5

2018

6.6

2008

7.2

2015

5.7

2011

7.3

2009

7.6

1993

10.0

2019

7.3

2010

7.0

1977

7.4

2020

6.2

2022

4.5

1992

7.4

2016

5.2