Year	kg per PPP $ of GDP
1990	1.4737578928854491
1991	1.4649730456006531
1992	1.4760488587857044
1993	1.3902874273751369
1994	1.3486485934090944
1995	1.2915758590506563
1996	1.2317749873282064
1997	1.1177281197097677
1998	1.1724712604784855
1999	1.1212329629906639
2000	1.0329843715939608
2001	0.9760734725903656
2002	0.918192016754141
2003	0.8755877467031805
2004	0.7845709806291737
2005	0.7087586569675857
2006	0.6234752703086678
2007	0.5675728196819708
2008	0.5013676923814162
2009	0.4737811796767589
2010	0.46226629335416924
2011	0.4387224695045357
2012	0.40728023125347845
2013	0.3713420553855271
2014	0.34970751897108965
2015	0.3443360054758316
2016	0.33753223280286676
2017	0.3235009762062026
2018	0.3082916800918726
2019	0.2840812302308719
2020	0.2690959710805158