Year	kg per PPP $ of GDP
1990	0.6353140273095625
1991	0.5955004827572838
1992	0.6207805748918511
1993	0.5939195050786011
1994	0.5898460182738586
1995	0.5695289830159518
1996	0.5584955378790242
1997	0.5508086358148425
1998	0.5376770630339215
1999	0.5133125351026037
2000	0.5353830018528296
2001	0.49685563621874435
2002	0.4802216892504007
2003	0.4637991259168379
2004	0.44656186447776086
2005	0.4281244783625414
2006	0.38998446092616146
2007	0.3670688803889322
2008	0.31865799637965353
2009	0.31144192325749076
2010	0.2939270212778079
2011	0.2880782379119009
2012	0.32648679794292534
2013	0.3034159038844859
2014	0.3178350773858662
2015	0.2957073077671447
2016	0.2825172311095019
2017	0.27441809854614746
2018	0.2611931105972784
2019	0.23003985052410925
2020	0.20151863486093718