Year	kg per PPP $ of GDP
1990	0.34863539844102276
1991	0.35327039498900525
1992	0.3544824646522028
1993	0.3421734121298736
1994	0.3202906509717343
1995	0.337408640848525
1996	0.3562620475596666
1997	0.31746057872920813
1998	0.34832264355437575
1999	0.355818874607004
2000	0.35768026727151564
2001	0.3507009959637024
2002	0.3311632481515935
2003	0.3432665235548974
2004	0.31417779688199626
2005	0.29508881428325684
2006	0.26432719468082616
2007	0.2206227893504027
2008	0.2388754889169162
2009	0.23417962975142176
2010	0.2390554399142557
2011	0.21928385682087417
2012	0.20747271213609605
2013	0.2087673563653272
2014	0.20288405784059013
2015	0.2094504088873393
2016	0.21713614345975077
2017	0.16746750441714459
2018	0.14997984821924018
2019	0.145828945035404
2020	0.15937748703277274