Year	kg per PPP $ of GDP
1990	0.502561196782865
1991	0.5023923738779134
1992	0.5231766127054555
1993	0.525248209121994
1994	0.49004904538939625
1995	0.5339664448086842
1996	0.5375478882729763
1997	0.518221374013472
1998	0.4872593345144351
1999	0.4401234754305627
2000	0.4061059493859956
2001	0.40734348488076866
2002	0.384535644053801
2003	0.3657828612208751
2004	0.3453865642514607
2005	0.3335632168244059
2006	0.3156641064645597
2007	0.29259041124433244
2008	0.290110426415883
2009	0.2761301942657339
2010	0.27681323732275315
2011	0.26436067123908646
2012	0.2531328652155866
2013	0.23561808349915495
2014	0.2060016572810776
2015	0.20132575107571196
2016	0.19838937931174022
2017	0.1872207101318101
2018	0.1741190594892579
2019	0.1530677347207904
2020	0.14116571956692797