Year	kg per PPP $ of GDP
2008	0.048669001511271466
2009	0.04796538062915815
2010	0.04570759006087951
2011	0.045817178421645996
2012	0.09304894119658032
2013	0.0678888180951712
2014	0.0985280703240073
2015	0.15352382613723362