Year	kg per 2015 US$ of GDP
1990	1.2747351714584443
1991	1.3161336204885765
1992	1.295246005116832
1993	1.2390108116406549
1994	1.1508307025620577
1995	1.074708912628921
1996	1.0635624063021485
1997	1.048485470697674
1998	1.0001415180097555
1999	0.9254745517049822
2000	0.9877342500592403
2001	0.9556800290252789
2002	0.9096461986295994
2003	0.9012819529063246
2004	0.8627640775931533
2005	0.796962036240888
2006	0.7504919486800703
2007	0.7217934265181838
2008	0.670629631657074
2009	0.670966781398332
2010	0.6603477149960225
2011	0.6321708350499693
2012	0.6148303962318462
2013	0.5898371248924984
2014	0.560257133298913
2015	0.5380304140818328
2016	0.5342109529792606
2017	0.5106779123268099
2018	0.49084981463011473
2019	0.4531290229179732
2020	0.4359502116575119