Year	kg per 2021 PPP $ of GDP
1990	0.5093041746231539
1991	0.5186961998358846
1992	0.528928008028078
1993	0.5207726696078195
1994	0.5034756311573854
1995	0.506502161897154
1996	0.48724767339736624
1997	0.4633393785364014
1998	0.4605485056368535
1999	0.4367580428401361
2000	0.4245967199008098
2001	0.4189109131055204
2002	0.4135414477862744
2003	0.4267889655343922
2004	0.4339183747793093
2005	0.4399624097314475
2006	0.43472622650819964
2007	0.4202937079023976
2008	0.4062038487819781
2009	0.40663074479632655
2010	0.41046396748724995
2011	0.4139893506655996
2012	0.4012493760597653
2013	0.3947038107861129
2014	0.37734440004102743
2015	0.35878484162437907
2016	0.345096205449952
2017	0.3357720290893916
2018	0.33206213952662256
2019	0.3244619945806293
2020	0.3259214780121405