Year	kg per PPP $ of GDP
1990	0.8066955741562258
1991	0.7760678709690886
1992	0.7465210312627866
1993	0.7246405286861909
1994	0.6926308783700157
1995	0.668047646394812
1996	0.6526307513390529
1997	0.6448576559955207
1998	0.6162005170751292
1999	0.5823440062777443
2000	0.563860369468669
2001	0.5427992671187556
2002	0.5139025693802908
2003	0.4969191657315255
2004	0.4716099324115359
2005	0.44337857589040053
2006	0.4112128821415182
2007	0.3997249504406078
2008	0.3790326202339026
2009	0.3595897113640663
2010	0.36115899762383746
2011	0.33595195573849473
2012	0.31040274253618433
2013	0.3062926910647843
2014	0.29473523898152276
2015	0.27894130413508417
2016	0.26607500552752444
2017	0.2519507271310691
2018	0.2467189324907097
2019	0.22980876213239748
2020	0.20872238551680056