Year	kg per 2015 US$ of GDP
1990	1.9053536916264502
1991	1.663247143971143
1992	1.688118561293394
1993	1.7308474418008994
1994	1.633033051748107
1995	1.6218394104493021
1996	1.5533598264012405
1997	1.73320451238206
1998	1.590611780465109
1999	1.524655438909594
2000	1.4281523260182587
2001	1.4631329190232893
2002	1.3046134641105662
2003	1.3629018992437918
2004	1.2617730327102186
2005	1.1965576998110876
2006	1.1429736384697038
2007	1.1514291429148131
2008	1.0321363512306494
2009	0.9156877336021332
2010	0.9401780440035923
2011	1.0217275988700707
2012	0.9198558999001515
2013	0.814719925423297
2014	0.8557668382798626
2015	0.8768893918868241
2016	0.7943990559671202
2017	0.8158996302601115
2018	0.740414532578437
2019	0.681446952695611
2020	0.6185937297851335