Year	kg per 2015 US$ of GDP
1990	0.37566765807378355
1991	0.3676300137502769
1992	0.3852898042898076
1993	0.38024775486271684
1994	0.4045454670411574
1995	0.4401074573399523
1996	0.4963108391943915
1997	0.49467166041790434
1998	0.469738800459835
1999	0.4355660754021909
2000	0.4395750791157458
2001	0.46391634418780103
2002	0.4406839698185255
2003	0.4368963566824411
2004	0.4341980179525149
2005	0.44410231995463595
2006	0.454372112303984
2007	0.4534318058942531
2008	0.44011067283631067
2009	0.47397423580043774
2010	0.4920083049412463
2011	0.4516250708794282
2012	0.42680218957168176
2013	0.4261764223239647
2014	0.43052590299801113
2015	0.4257842629013908
2016	0.4121749530138379
2017	0.3768087949605789
2018	0.3895909618092111
2019	0.3827492985834955
2020	0.36639920750527777