2009

6.5

2011

7.4

2013

5.9

2008

6.3

2017

8.1

2019

8.1

2014

7.4

2016

7.4

1982

8.1

2018

7.6

2015

7.5

1986

7.1

1988

8.1

2009

8.2

2015

7.3

2010

8.4

1995

8.4

2020

8.1

2008

7.8

1985

7.7