Year	kg per PPP $ of GDP
1990	1.4100651979537027
1991	1.2951925046819004
1992	1.226918750774847
1993	1.1009933488248598
1994	1.0147877797903198
1995	0.9821157322445166
1996	0.956031762921565
1997	0.9053940302960555
1998	0.7974648245521241
1999	0.6756228678593827
2000	0.6780389801151608
2001	0.6598135547304206
2002	0.590779037040375
2003	0.6016702598502427
2004	0.4943279107258668
2005	0.46251881414752083
2006	0.4052427548862903
2007	0.33802398982272003
2008	0.276819877018553
2009	0.23823814926120296
2010	0.2208801936760641
2011	0.22187811080923228
2012	0.20599284721310848
2013	0.18334279990090954
2014	0.17417281845202515
2015	0.17110721541685647
2016	0.15199858578135536
2017	0.14061628152761974
2018	0.1305910105736038
2019	0.11377443322760354
2020	0.10393141422264304