Year	kg per 2011 PPP $ of GDP
2002	0.0549501379034397
2003	0.0556076268783347
2004	0.0369712277861335
2005	0.0272087121896602
2006	0.0196048076758213
2007	0.0190042546212689
2008	0.0190175290876645
2009	0.0228164261617201
2010	0.0238317630535834
2011	0.0223841244688775
2012	0.0254489794301004
2013	0.0429331303651163
2014	0.0618080593516806