Year	kg per 2015 US$ of GDP
1990	0.5862320883389085
1991	0.5340796732790345
1992	0.5185649015547071
1993	0.4514646295017745
1994	0.3849279928477585
1995	0.3864641386364449
1996	0.38270260489480606
1997	0.35633392603151176
1998	0.3414664748914722
1999	0.3657905691733039
2000	0.33111344926582603
2001	0.37970219763355567
2002	0.3944702324660581
2003	0.4048340849629019
2004	0.36465542824016844
2005	0.37018497916849513
2006	0.3938391439724673
2007	0.3032623537422387
2008	0.29298928113455014
2009	0.3192853376818435
2010	0.33201019090363726
2011	0.33489296980671274
2012	0.30722081499517817
2013	0.29158306940125905
2014	0.28633554510772385
2015	0.2856803857556552
2016	0.2975179199068967
2017	0.30647629048770697
2018	0.3005756562429415
2019	0.2916821286535231
2020	0.370338978678671