Year	kg per 2015 US$ of GDP
1990	2.642463297312339
1991	2.590224640530747
1992	4.089258415046034
1993	4.016820589994517
1994	3.4889804724470457
1995	3.83296329549143
1996	3.1683949261382014
1997	2.917206195996149
1998	2.652095745566795
1999	2.435031069482684
2000	2.3230563201520837
2001	2.015305416273087
2002	1.8261693640436332
2003	1.808414764729068
2004	1.6403230275893674
2005	1.3602852673870645
2006	1.0263447465752649
2007	0.7440349716909602
2008	0.7403255587636397
2009	0.5671952796938097
2010	0.5148623940667426
2011	0.5771862670964026
2012	0.6235258244027772
2013	0.6055135043698001
2014	0.6141380377248893
2015	0.5986351478705406
2016	0.6268491796789356
2017	0.6201180784272654
2018	0.6256956579299797
2019	0.6625271280108501
2020	0.6685962992003878