2014

8.3

2016

6.8

1998

7.2

2009

7.6

2016

7.2

2013

6.8

2018

7.4

2018

7.7

2016

6.9

2013

7.1

2012

7.5

2011

7.8

1988

7.4

2015

7.7

2011

6.1

2018

7.7

2010

7.1

2014

7.4

2017

8.2

1966

7.6