Year	kg per 2015 US$ of GDP
1990	0.8493125692177967
1991	0.8702255660740911
1992	0.8950390960798899
1993	0.9437850324201281
1994	1.003242779554055
1995	1.011123121792345
1996	0.9772215205225684
1997	0.9922331426678217
1998	0.9140332612472942
1999	0.908130829286675
2000	0.8980565594491788
2001	0.917687011143146
2002	0.9090897599704736
2003	0.915342851739507
2004	0.9030748485792555
2005	0.9307073856441374
2006	0.9276351916159157
2007	0.9094380868971533
2008	0.9111256323244648
2009	0.9208078259233785
2010	0.8914543816766782
2011	0.9048619624064153
2012	0.9153910503135164
2013	0.9323580293334455
2014	0.9381054969847619
2015	0.9241622405569965
2016	0.8881446809701518
2017	0.8957627218677097
2018	0.8968694960707003
2019	0.880874304845303
2020	0.8774464027309018