Year	kg per PPP $ of GDP
1990	0.6034186546026232
1991	0.6266636244582791
1992	0.6007977975218797
1993	0.6041474075302189
1994	0.6377793294647874
1995	0.5610450977939908
1996	0.6080749749909388
1997	0.5412883326143656
1998	0.4713106139017547
1999	0.4417087811331904
2000	0.3973544055715982
2001	0.42349679702547227
2002	0.4264459819787724
2003	0.47346370626890455
2004	0.4148946678006777
2005	0.32983205064637766
2006	0.3693876496584671
2007	0.32525040535622646
2008	0.26603399332097905
2009	0.2672654509576499
2010	0.29931103833148187
2011	0.2500255638501399
2012	0.2232773659052811
2013	0.22240026621884193
2014	0.2024116147503347
2015	0.18386164448376185
2016	0.1850751007663742
2017	0.16416432679395954
2018	0.16234967807608947
2019	0.14120349693902226
2020	0.12242015455011335