1985

8.7

2008

5.5

2020

3.0

2010

5.9

2019

0.0

2015

7.7

2007

8.2

2016

6.7

2008

7.0

2012

7.3

2013

7.5

2011

7.2

2009

7.4

2010

7.5

2014

7.5