Year	kg per 2015 US$ of GDP
1990	3.3982803933655976
1991	4.012315846617011
1992	3.584010167035514
1993	1.8174972926391495
1994	0.9386688348942908
1995	1.1144384673943908
1996	0.7602192673310191
1997	0.9855169931804336
1998	0.9649406459287234
1999	0.8299379805848569
2000	0.8993730666614259
2001	0.830043892507399
2002	0.6348695874715349
2003	0.6241700899941518
2004	0.6082334933657012
2005	0.6329108740709063
2006	0.5626555369344077
2007	0.5736986742150864
2008	0.5862787277133721
2009	0.5414967829117048
2010	0.509378697642283
2011	0.5538812394856236
2012	0.5982464828231445
2013	0.5573535118829912
2014	0.5357857635157979
2015	0.5063232357229704
2016	0.4791457505773029
2017	0.47251260189749117
2018	0.47766305424707706
2019	0.4814922998133534
2020	0.5649928616423883