Year	kg per 2015 US$ of GDP
1990	0.5688820416550575
1991	0.5542324264951588
1992	0.5290884788277578
1993	0.45956297132783236
1994	0.37136283474987575
1995	0.4579597076678449
1996	0.5279878758791043
1997	0.5477736833943965
1998	0.6265698388291634
1999	0.6574663949562142
2000	0.67058516383071
2001	0.6306402216413813
2002	0.39152021106513624
2003	0.45456880872762423
2004	0.4787454336256157
2005	0.5452594786263647
2006	0.5593384869913808
2007	0.52032397037859
2008	0.5142050497319174
2009	0.511090646100801
2010	0.5211085603397773
2011	0.5061592252921976
2012	0.4498297769548286
2013	0.45743759465175265
2014	0.4179069401064936
2015	0.4547723155008457
2016	0.484165212343633
2017	0.504378631689117
2018	0.5936396745360635
2019	0.6615597578836873
2020	0.7206870202727413