1960

7.0

1999

8.2

2012

6.9

2014

6.8

2013

7.4

2016

5.8

2012

7.8

2015

6.4

2013

7.2

2004

6.6

2018

7.6

2011

6.0

2006

5.5

2010

7.1

2015

6.7

2016

7.0

2016

7.6

2016

6.6

2018

6.6

2014

7.0