Year	kg per PPP $ of GDP
1990	0.8064190065476747
1991	0.6757527907487175
1992	0.7345269878347652
1993	0.676832021851256
1994	0.6798920120460975
1995	0.6485994023149458
1996	0.6397758347746549
1997	0.6213012100518037
1998	0.6299581158920515
1999	0.5940962883139056
2000	0.566894019722803
2001	0.5583063077742092
2002	0.5590622560066234
2003	0.5374054924353452
2004	0.4887246853657368
2005	0.5123118304138197
2006	0.5072140347790292
2007	0.46646979968464497
2008	0.4637345897665101
2009	0.44865708553385725
2010	0.4463174206734082
2011	0.4296474751416945
2012	0.41198532784641057
2013	0.4250026316703735
2014	0.4418458868397268
2015	0.4840512364065633
2016	0.4714773117705326
2017	0.4254357644704249
2018	0.4131179917227787
2019	0.41077028976764396
2020	0.42724043533077877