Year	kg per PPP $ of GDP
1990	0.3179303015122506
1991	0.3009504089695824
1992	0.308379598951395
1993	0.29729711838951695
1994	0.30968198606726194
1995	0.3299861223109358
1996	0.36543631587984293
1997	0.3580549092557804
1998	0.3362291585543032
1999	0.30741876320486833
2000	0.30337621980224067
2001	0.31312493397428265
2002	0.29289247917345307
2003	0.2847531878446016
2004	0.275583818303926
2005	0.2733008178868913
2006	0.2712557688428179
2007	0.2635540543994553
2008	0.2509756668002755
2009	0.2686297040085984
2010	0.27550254975547
2011	0.24777782491183478
2012	0.23246529633679308
2013	0.22235135162329808
2014	0.22025501850860715
2015	0.2339228765168793
2016	0.221556745641983
2017	0.19503519133367894
2018	0.19382535645529111
2019	0.18221656846337708
2020	0.1702397999031122