1990

5.0

1980

6.0

2016

6.8

2017

7.7

2022

7.0

2006

5.9

1988

6.7

1976

3.7

1965

6.9

2017

6.2

1982

6.2

2008

5.1

2010

0.0

2014

6.8

2012

7.5

2018

5.0