Year	kg per PPP $ of GDP
1990	1.7428143245780423
1991	1.748073007413317
1992	1.6720314446822577
1993	1.6540924486330353
1994	1.7486545207130102
1995	1.8736751622589005
1996	1.772325682290145
1997	1.703446628596676
1998	1.6179722780684125
1999	1.5801777607505871
2000	1.4192474471221268
2001	1.2893551847255784
2002	1.2188542604083252
2003	1.185786611065449
2004	0.9606697239749904
2005	0.8691938285448768
2006	0.8066208789040019
2007	0.7451815361318049
2008	0.6899777499124484
2009	0.6750480137690016
2010	0.6847979075783709
2011	0.6704208592422092
2012	0.6277798998885986
2013	0.5373581560102135
2014	0.5183885612329269
2015	0.4430791449826083
2016	0.42913745716701474
2017	0.35232762385883104
2018	0.3455404828180878
2019	0.28888323860747506
2020	0.2524953327512822