Year	kg per PPP $ of GDP
1990	0.5157437680262902
1991	0.4425742627500587
1992	0.39790775331427614
1993	0.38481819361287734
1994	0.38942894697175884
1995	0.37285041169076255
1996	0.3859334035035797
1997	0.40355046524631705
1998	0.38848531160843464
1999	0.4019852681247599
2000	0.34690411715858166
2001	0.3158468345775555
2002	0.30568140028287544
2003	0.29253364607726234
2004	0.2924457718000921
2005	0.2727738308404301
2006	0.22317345590847465
2007	0.2319685104258698
2008	0.24656553814542018
2009	0.2412233106414006
2010	0.22656428579609422
2011	0.21902045872088788
2012	0.20948202691089932
2013	0.21136938862099128
2014	0.19002204628625555
2015	0.20286181250782978
2016	0.2036211088429458
2017	0.19325454612078216
2018	0.18109684951254085
2019	0.1869384763911164
2020	0.1727435480860018