Year	kg per PPP $ of GDP
1990	0.7488458792484842
1991	0.7288599224735063
1992	0.7285945804583847
1993	0.686253586012741
1994	0.6654272241889865
1995	0.6510559253963043
1996	0.6483368210456902
1997	0.6312180362484081
1998	0.6108195554242832
1999	0.5839685019550221
2000	0.5707178908840637
2001	0.5402250414164704
2002	0.5400116934189616
2003	0.5319440234288803
2004	0.4950283305926973
2005	0.46872741826047615
2006	0.43534809494485405
2007	0.43917864151211283
2008	0.41012731409501285
2009	0.39892810838026804
2010	0.3938841643808154
2011	0.3839581438142839
2012	0.3721084111532094
2013	0.3575918281991474
2014	0.3464672738788018
2015	0.3503442818139891
2016	0.33184949247160955
2017	0.32177367259320777
2018	0.3127783593137083
2019	0.2979434543809699
2020	0.279718156724713