Year	kg per PPP $ of GDP
1990	0.6415557572170553
1991	0.618755575173586
1992	0.5861172353928358
1993	0.5601563122550003
1994	0.5376837690329073
1995	0.48957478135179877
1996	0.4675608123673429
1997	0.43260001515978314
1998	0.4123970178891886
1999	0.3936919051079427
2000	0.37001008192623003
2001	0.35581731565486713
2002	0.31720293999993854
2003	0.30401712612913045
2004	0.2834440467884186
2005	0.277127202806653
2006	0.25003079943280054
2007	0.22645622438503843
2008	0.2315255174630575
2009	0.21577534588145508
2010	0.2047980035640303
2011	0.1765784514512685
2012	0.1738485756981798
2013	0.16148124974680764
2014	0.14898577679815994
2015	0.11395904383685962
2016	0.1148765350354824
2017	0.10039981061059071
2018	0.09066389782407638
2019	0.07980754450982509
2020	0.06972759111342341