Year	kg per PPP $ of GDP
1990	0.731278061933142
1991	0.7006348544085141
1992	0.6736019394602974
1993	0.6637719883426433
1994	0.6414649520691452
1995	0.6387314015914934
1996	0.5976222431662385
1997	0.5746009749985643
1998	0.5682033115622126
1999	0.541499061448143
2000	0.5231565790863107
2001	0.510971282209558
2002	0.5030195821746222
2003	0.515980039410464
2004	0.5210488210402503
2005	0.5185604588073124
2006	0.5020739933365961
2007	0.48197381696944225
2008	0.4580688594899574
2009	0.45844288768295605
2010	0.4557270083761525
2011	0.4541843639271039
2012	0.43273898958146784
2013	0.4209850621464286
2014	0.40342918473091144
2015	0.38459027112724503
2016	0.36944104794735205
2017	0.35766946817987916
2018	0.346991144047669
2019	0.33183771106421656
2020	0.3252942758262927