1985

8.9

2008

5.5

2020

0.0

2010

5.8

2019

0.0

2015

7.7

2007

7.8

2016

6.7

2008

7.0

2012

7.3

2013

7.5

2011

7.2

2009

7.4

2010

7.5

2014

7.4