2011

8.5

2015

8.0

2017

7.0

1975

7.1

2014

7.6

2013

7.5

2008

7.7

2016

7.3

2010

6.9

2012

6.2

2007

7.7

2008

7.6

1990

7.6

1984

7.5

1995

7.3

2021

8.5

2001

6.5

2014

7.3

2004

5.8

2014

7.3