Year	kg per PPP $ of GDP
1990	1.1833159423782096
1991	1.1380106583563183
1992	1.0590340040074813
1993	0.9787357208573166
1994	0.9527621571819629
1995	0.89522664946525
1996	0.8955495099327434
1997	0.9032703796578142
1998	0.8883259340325552
1999	0.8743104037273456
2000	0.808387081664391
2001	0.7927678190411207
2002	0.7767628344104972
2003	0.7931143180996906
2004	0.7696286778989551
2005	0.7462370009151411
2006	0.7342870642230576
2007	0.7172520274221255
2008	0.6873919660902298
2009	0.671084107884024
2010	0.6968728913354192
2011	0.6956096207645651
2012	0.6820393403583878
2013	0.6853691301635015
2014	0.6882019828395155
2015	0.6856233002119423
2016	0.6612690419335365
2017	0.6155521230887296
2018	0.5856496388891644
2019	0.5356633381029694
2020	0.5340310105526831