Year	kg per 2021 PPP $ of GDP
1990	1.163448444756307
1991	1.1279312304173355
1992	1.0372197236303193
1993	0.9963560803204463
1994	0.9221788699384411
1995	0.9275197119534841
1996	0.8388448497014743
1997	0.7838221379354354
1998	0.750490127778723
1999	0.6792866288485356
2000	0.6644191468876294
2001	0.6467521737301462
2002	0.6374730168394784
2003	0.6751969028344873
2004	0.7086437569779452
2005	0.7246656007132296
2006	0.7105264426369782
2007	0.6757039184485396
2008	0.6344229477380667
2009	0.6217603548270361
2010	0.6170178879512406
2011	0.6168986197344198
2012	0.5878192589290444
2013	0.5705334251356294
2014	0.5333262907394429
2015	0.4902005695100768
2016	0.45885580864915615
2017	0.4389848403045524
2018	0.43071019560595397
2019	0.41404343402569976
2020	0.4118204614091133