1987

10.0

2006

7.8

2015

8.3

2015

7.8

2007

7.7

2015

6.8

2017

8.1

2004

7.7

2020

8.1

2014

7.6

2018

8.2

2019

8.0

2017

6.8

2019

8.3

1989

7.7

2010

7.7

2011

8.2

2016

7.9

2014

7.8

2017

7.4