2017

6.5

1998

6.2

2018

6.1

1989

5.9

2013

6.1

2017

4.9

2015

5.7

2016

5.0

2019

6.6

2012

5.8

2006

6.7

2020

5.3

2018

5.6

2019

6.3

1982

6.4

2018

6.4

2016

6.1

2015

5.9

2013

5.8

2019

5.5