2013

5.9

2019

8.1

2012

7.8

2018

6.8

2011

8.3

2016

7.6

2017

6.8

2007

7.8

2015

7.6

1971

8.2

2019

7.4

2010

7.7

2014

8.5

1990

7.5

2019

7.8

2018

8.2

2018

7.5

2017

8.1

2017

6.3

2009

7.0