2011

8.5

2012

6.8

2005

7.6

2001

8.4

2013

8.6

2016

7.5

2007

7.7

2010

8.1

2001

8.1

2008

8.4

2016

6.9

2005

7.0

2002

8.3

2009

7.8

2019

8.2

1997

7.9

1990

8.0

2016

7.3

2017

8.0

2008

8.9