2016

7.3

2011

8.5

2009

7.4

2005

7.6

2010

8.1

2001

8.0

2013

7.7

2009

7.2

2013

7.7

2012

7.6

2014

7.6

2015

8.3

2001

8.1

2015

7.8

2013

7.5

2020

8.1

2000

6.9

2019

8.7

1989

8.0