2008

8.9

2001

7.6

2014

8.2

2010

8.5

2011

8.5

2017

6.1

1995

7.8

1987

8.4

2013

7.7

2020

6.5

2010

8.1

1966

8.0

1993

7.9

2017

7.6

2016

8.0

2015

8.2

2013

7.6

2014

7.3

2017

7.4

2018

7.8