Year	kg per 2015 US$ of GDP
1990	1.3223142487812312
1991	1.3291930767411002
1992	1.3153713957643975
1993	1.2679684098918176
1994	1.1969017932336419
1995	1.189903134178893
1996	1.1338974345745343
1997	1.0695723534176431
1998	1.0501574312708741
1999	0.9945584730647031
2000	0.9673068111252108
2001	0.9525810854695983
2002	0.9382269329154016
2003	0.9672504008700863
2004	0.9811060738677018
2005	0.9915423183054972
2006	0.9768491561463246
2007	0.9407275700709288
2008	0.9066109856043323
2009	0.8960148128420931
2010	0.9000713658269478
2011	0.9038820005262869
2012	0.8739899793158296
2013	0.855923261317922
2014	0.8142851507357612
2015	0.768892854307915
2016	0.7363053402689672
2017	0.7142903389056734
2018	0.7047079783949303
2019	0.686975770480917
2020	0.686505481402764