Year	kg per PPP $ of GDP
1990	0.9874515716678104
1991	0.9156461051962285
1992	0.855463448240622
1993	0.8166811420084763
1994	0.7149740485137046
1995	0.5530509324915527
1996	0.5311827508546716
1997	0.46259565500676975
1998	0.4024144331553805
1999	0.369126233619929
2000	0.35577716182531244
2001	0.3678594884800344
2002	0.3756762429824141
2003	0.37669478887389307
2004	0.3934310534599422
2005	0.3723104585398903
2006	0.31429689035376546
2007	0.27200232968030336
2008	0.24795939421626714
2009	0.24148766830889745
2010	0.24080367851209528
2011	0.2227202577794796
2012	0.20850255333345455
2013	0.18551343956752456
2014	0.1646206204506616
2015	0.14866211119127845
2016	0.13406917196655826
2017	0.13134715030315894
2018	0.13160274496348762
2019	0.12621546284250063
2020	0.10201076754889737