Year	kg per PPP $ of GDP
1990	0.427820070306921
1991	0.40033392481571056
1992	0.3695288588864717
1993	0.3408135442764568
1994	0.3200158384162151
1995	0.3254392032888439
1996	0.32876422750820217
1997	0.30765915441430164
1998	0.30817815206848553
1999	0.3188695641540953
2000	0.3090602991568642
2001	0.2994361152425405
2002	0.3103162935235956
2003	0.30385894430776045
2004	0.3005713686620255
2005	0.2764819726551614
2006	0.2634051311099032
2007	0.24726660173411497
2008	0.23945050756379574
2009	0.2368230552532187
2010	0.2269307467720777
2011	0.22155976729412932
2012	0.21722532605370473
2013	0.21594418690702144
2014	0.2142112220366832
2015	0.21447009560929092
2016	0.20751018243054103
2017	0.17308821221552095
2018	0.1622821965624379
2019	0.15899841870597087
2020	0.15270354946682385