Year	kg per 2015 US$ of GDP
1990	5.220151728011416
1991	5.323961735485671
1992	5.251717398586132
1993	4.8907408956013825
1994	4.824507211224806
1995	4.623314724390191
1996	4.299461931395632
1997	3.863473755372406
1998	3.7760953718542996
1999	3.8135197862122
2000	3.6656019578010715
2001	3.65430885550654
2002	3.4798533630717863
2003	3.4003156921517474
2004	3.10085617859317
2005	2.8749340714900926
2006	2.765194131571246
2007	2.63445014349579
2008	2.590879614226562
2009	2.4760175660054102
2010	2.4296784960627793
2011	2.3609907505566268
2012	2.2405632756541163
2013	2.0631463840578417
2014	1.9314034261297004
2015	1.8172089999431043
2016	1.788390972453585
2017	1.727494539724088
2018	1.7164042359238405
2019	1.6836638758543698
2020	1.6257391265540406