1993

5.5

2012

6.0

2014

4.5

2020

3.7

2010

7.2

2016

7.2

1999

6.6

2017

8.0

2012

6.2

2018

6.1

2017

5.4

2011

7.1

2005

6.4

2015

7.1

2015

6.7

2015

7.8

2016

7.3

2004

5.8

2019

6.0

2017

6.0