Year	kg per PPP $ of GDP
1990	0.6480777832925579
1991	0.593022837619733
1992	0.6257627926117382
1993	0.5709085609258703
1994	0.5551664826465212
1995	0.550162528473645
1996	0.5636176783018925
1997	0.5701554138408688
1998	0.6103371705948996
1999	0.6112125390668068
2000	0.5975048709261737
2001	0.577445454411546
2002	0.5666000610816122
2003	0.554048654312198
2004	0.53123500115924
2005	0.5101209133339457
2006	0.5490285355366288
2007	0.5256758219362312
2008	0.41604558833356164
2009	0.354296912380633
2010	0.3367938532510534
2011	0.3265239897932368
2012	0.29976400018227906
2013	0.30812242326382244
2014	0.2947581756955557
2015	0.2814943953566152
2016	0.28584555266404416
2017	0.26128888800456196
2018	0.3034932745397061
2019	0.29486244393791095
2020	0.22928194744040623