Year	kg per 2015 US$ of GDP
1990	0.6753010101633334
1991	0.5820131204339024
1992	0.5226895179426565
1993	0.5683726573230452
1994	0.6082104817685877
1995	0.6334213554628009
1996	0.6387749497411375
1997	0.6768298878113137
1998	0.6674897647455887
1999	0.649129401378255
2000	0.6206411664319983
2001	0.5826456643702769
2002	0.552674499026861
2003	0.5164603538133048
2004	0.48325775738879645
2005	0.45090740483002806
2006	0.4094271245025221
2007	0.3944965499854556
2008	0.3661610314342553
2009	0.3640602711210304
2010	0.370458522222988
2011	0.3536465001091517
2012	0.35704259872226335
2013	0.3496603893628719
2014	0.3197546582897405
2015	0.33523311542840356
2016	0.31030494627983446
2017	0.29430156345697206
2018	0.292583974668267
2019	0.26827515776382466
2020	0.30014141479770223