Year	kg per PPP $ of GDP
1990	0
1991	0
1992	0.6960835197995472
1993	0.6718648786988751
1994	0.703323919379373
1995	0.7472400677170967
1996	0.783764207090431
1997	0.8639665940437175
1998	0.8830937513211878
1999	0.7999618216534194
2000	0.7012455681283924
2001	0.6232298383786012
2002	0.5556015548383789
2003	0.5709750764840543
2004	0.5096852102665141
2005	0.39533480725013515
2006	0.3794218775971212
2007	0.4224293678165784
2008	0.3667340863394409
2009	0.4686159930178496
2010	0.31294562646109536
2011	0.3369715075229503
2012	0.3741208794840143
2013	0.3995096107771215
2014	0.4091937971309817
2015	0.39823912647752907
2016	0.3985503074333249
2017	0.38728639169398904
2018	0.38145173884497463
2019	0.3614182744908123
2020	0.2639202468380695