Year	kg per 2015 US$ of GDP
1990	0.3989757712608096
1991	0.4172854882656909
1992	0.48073403032933193
1993	0.5213654305197233
1994	0.5379490683876965
1995	0.5436991060043115
1996	0.5550394129013488
1997	0.5653944707347325
1998	0.4656413801139851
1999	0.41881081694370165
2000	0.43750247146779225
2001	0.4453386980770713
2002	0.3985221562204008
2003	0.40418776369173715
2004	0.37854698748548066
2005	0.3594302631741148
2006	0.33174421514665975
2007	0.3041252345866627
2008	0.3126731857912565
2009	0.30504581951069015
2010	0.3223599973417588
2011	0.3254488654523716
2012	0.32943263520390564
2013	0.33783884501283734
2014	0.3317620263855545
2015	0.3241974779061441
2016	0.33052350358259097
2017	0.3351245446928991
2018	0.34201993234852074
2019	0.35170679431191526
2020	0.33460405358801976