Year	kg per PPP $ of GDP
1990	0.4017879146830811
1991	0.4026890691798467
1992	0.386472451292683
1993	0.3547647232607061
1994	0.3609818202474127
1995	0.3529341113321375
1996	0.34526085479279467
1997	0.3531484882356358
1998	0.3582793205312426
1999	0.37427259277909314
2000	0.3444275553306829
2001	0.3533378273914082
2002	0.34223388014687234
2003	0.3403340925077675
2004	0.33473111708447467
2005	0.3233994355446175
2006	0.30056513892054193
2007	0.29080330409798516
2008	0.33577414844496856
2009	0.3471553911160838
2010	0.32484838608186883
2011	0.32828313475268994
2012	0.336900069663874
2013	0.32889897744279784
2014	0.295475890508961
2015	0.28521586177717206
2016	0.2817865858694199
2017	0.25962198954921445
2018	0.26776624341220717
2019	0.23862232080483525
2020	0.265870681586758