Year	kg per PPP $ of GDP
1990	0.43117732841240125
1991	0.39864064219852463
1992	0.39920318551664324
1993	0.40859085434670106
1994	0.4209073175476796
1995	0.4139684000074192
1996	0.4010827170855828
1997	0.3977968372649028
1998	0.37751134768143396
1999	0.3781516225725212
2000	0.3621741146325752
2001	0.3658058786956772
2002	0.3666975320771609
2003	0.35634098037986345
2004	0.3391336271056848
2005	0.3353585547378818
2006	0.326176561633055
2007	0.31598515337816774
2008	0.31519962309786015
2009	0.32147783430032945
2010	0.31549509451919855
2011	0.3037750188638599
2012	0.3059146042910974
2013	0.3085371052788118
2014	0.31748169547442057
2015	0.34838864364058647
2016	0.34976591943645347
2017	0.3335100078487828
2018	0.3088728413163692
2019	0.30617129013518063
2020	0.30740964600034176