2018
6.8
6.2
7.2
3.6
2017
4.7
6.4
5.8
5.6
2019
5
2015
5.7
5.1
6.7
7.3
2013
7.5
5.9
5.4
2012
5.5
2011
4.9
2010
2009
6.5
6.3