2011

8.3

2016

7.1

2005

7.7

2015

8.7

2016

8.0

2011

7.6

2013

8.6

1997

7.5

2014

8.1

1985

7.7

2017

6.2

2009

7.7

2005

7.0

2008

7.7

2017

7.5

1999

7.4

2018

6.9

2001

7.8

2018

7.2

1997

8.1