2007

6.5

2013

6.9

2012

7.1

2015

5.3

2016

6.4

2018

6.0

2011

6.1

2010

6.8

2013

6.9

2002

6.9

1997

4.7

2011

6.4

2015

6.8

2002

7.0

2019

7.0

2016

7.4

2020

6.0

2019

6.8

2019

6.4