2014

8.3

2010

7.5

2008

8.9

2016

7.3

1993

8.0

2001

7.6

2016

8.6

2012

8.7

2006

8.2

1980

8.6

2015

7.8

2013

8.1

2018

7.8

2019

6.4

2010

8.0

2004

7.9

2008

8.4

2013

8.5

2017

3.9

2009

7.9