2010

5.2

2016

6.9

1998

8.1

2014

8.5

2015

7.3

2014

7.4

2001

7.9

2009

7.6

2018

7.5

2016

7.9

2016

7.3

1980

8.2

1972

8.7

2017

7.6

2012

8.2

1994

8.7

2010

8.4

1987

7.3

2018

7.5

2015

7.5