Year	kg per PPP $ of GDP
1990	2.037775900198731
1991	1.9211492243206052
1992	1.4692275541507922
1993	1.2433464534283654
1994	0.9889516605179774
1995	0.718992775808519
1996	0.8267367988387256
1997	0.7289980113982674
1998	0.7485250721157792
1999	0.565721259955843
2000	0.5091286532865936
2001	0.4034021395241339
2002	0.4978734870987641
2003	0.5126303779414859
2004	0.46460869328628207
2005	0.43090410077628494
2006	0.409657770286865
2007	0.44357952563578135
2008	0.4615257112876424
2009	0.40347745796078294
2010	0.38028920023845536
2011	0.42292917678636466
2012	0.5002097403202992
2013	0.40905655715574757
2014	0.39439627136399746
2015	0.409247271336145
2016	0.3403333676613145
2017	0.3021293026270967
2018	0.36722987359796977
2019	0.286571862571705
2020	0.26066703340737873