2005

7.5

2015

8.2

2019

7.1

2016

8.0

2017

8.1

2009

7.9

2017

7.1

2014

6.6

2011

6.8

1998

7.4

2011

7.6

2010

6.7

2017

7.1

1990

6.9

2018

8.2

2008

7.9

2017

5.9

2020

7.2

2001

8.3

2007

6.7