Year	kg per 2021 PPP $ of GDP
1990	0.5288044227782599
1991	0.545977937272449
1992	0.5373130289548788
1993	0.5139847175598378
1994	0.47740454567324786
1995	0.4458265833735291
1996	0.44120262541261435
1997	0.4349481888770103
1998	0.4148934382367612
1999	0.38391898730651447
2000	0.40974647256598534
2001	0.39644926838507494
2002	0.37735283670600817
2003	0.37388305707592906
2004	0.3579045046066168
2005	0.33060753244015123
2006	0.31133012613705346
2007	0.29942498239724247
2008	0.27820046328577885
2009	0.27834032470821995
2010	0.273935167146832
2011	0.2622464187156441
2012	0.2550530024318146
2013	0.24468492542267165
2014	0.232414117547703
2015	0.22319370244579986
2016	0.22160925732426226
2017	0.21184693472026708
2018	0.2036215511331055
2019	0.18797365662553
2020	0.1808472890662106