Year	kg per PPP $ of GDP
1990	1.4871034321407355
1991	1.3797085574335972
1992	1.5718087742181526
1993	1.3316772959999554
1994	1.531928865333642
1995	1.3068575392333341
1996	1.1682276746577303
1997	1.0405066858855883
1998	0.9939462471778873
1999	0.8621814338360764
2000	0.7534939272752403
2001	0.7264374641897936
2002	0.6791271047635933
2003	0.6754563788419622
2004	0.6132754324742623
2005	0.5815781527573194
2006	0.5251371341018831
2007	0.506607357874162
2008	0.4616795257421792
2009	0.45747785514860406
2010	0.45832208131833496
2011	0.4268943905579312
2012	0.39214608619625435
2013	0.30505859094508747
2014	0.3122312929686631
2015	0.307488313230514
2016	0.2813242096155707
2017	0.26011477234548214
2018	0.26629326588015206
2019	0.2496541887093659
2020	0.2415716536834702