Year	kg per 2015 US$ of GDP
1990	0.5322777649478333
1991	0.4825053132650042
1992	0.5654512257827482
1993	0.546645074384279
1994	0.49997722352341156
1995	0.4837730459056429
1996	0.41787160781325744
1997	0.40561136887852556
1998	0.48497884811367
1999	0.4634010485172769
2000	0.4750125555979537
2001	0.454067870224295
2002	0.4459256832445929
2003	0.41438668572194265
2004	0.4091685912546896
2005	0.4217246728618968
2006	0.3717378848678216
2007	0.37140807624479877
2008	0.3657804312182352
2009	0.4060493818665728
2010	0.296956933731357
2011	0.3201265705138863
2012	0.28194579311274925
2013	0.4029553981030183
2014	0.4914625567062456
2015	0.5136236050100348
2016	0.45701864186988034
2017	0.48585159385176924
2018	0.5123261381678903
2019	0.44401094367848404
2020	0.3895203337588713