2005

5.8

1968

6.4

2016

6.9

2017

7.3

2014

5.6

2011

7.2

2006

7.1

2014

8.4

2015

6.4

2001

7.3

2014

6.9

2008

6.7

2019

8.2

2002

5.6

1984

6.2

2018

5.0

2014

6.9

2016

7.2

2018

6.4

2019

6.5