2014

6.6

2006

8.2

2009

8.0

2014

7.6

2009

7.9

2004

7.3

2013

7.5

2002

8.3

2013

7.5

2014

8.3

1987

7.7

1999

7.1

2015

7.0

2018

7.4

2010

8.0

2015

7.6

2016

8.0

1975

8.2

2020

6.7

2001

8.6