Year	kg per PPP $ of GDP
1990	0.9248258213802968
1991	0.8810437706435514
1992	0.8278024293720093
1993	0.7835929416751438
1994	0.7303760004642652
1995	0.7144342241097377
1996	0.6667146573283338
1997	0.6321260625232279
1998	0.6237676451941565
1999	0.5940496090986377
2000	0.573420128110331
2001	0.5573325062444577
2002	0.5439008541894744
2003	0.5463172820105731
2004	0.5348591996922675
2005	0.5196816234079473
2006	0.49759899640438027
2007	0.47397905525441036
2008	0.4527797821177299
2009	0.44297933786242183
2010	0.43584785261438974
2011	0.4291940952855368
2012	0.41157318305343166
2013	0.39947351135802506
2014	0.38679389827756194
2015	0.37268367522360063
2016	0.35691588248682593
2017	0.3453461047626321
2018	0.3333359457987239
2019	0.3172596334593291
2020	0.3069693871485859