Year	kg per 2021 PPP $ of GDP
1990	0.3800251918758319
1991	0.3824107224323731
1992	0.3910208244361081
1993	0.3770388303846815
1994	0.3734051567172485
1995	0.37304375732148437
1996	0.3780279354036436
1997	0.3743797698863613
1998	0.3663794417406577
1999	0.3552838231758292
2000	0.3515495939168747
2001	0.33997935904193344
2002	0.34163608656487293
2003	0.3484944414968656
2004	0.332997452380688
2005	0.3302270589391698
2006	0.31675448267241296
2007	0.32825430589530963
2008	0.31303404240615984
2009	0.3053592331013323
2010	0.30511873262565614
2011	0.30260084745020566
2012	0.2957135471264348
2013	0.29399166915843106
2014	0.2888745718842475
2015	0.2854695706989096
2016	0.2815881486971055
2017	0.27884335349050304
2018	0.2768434292455667
2019	0.26529746109449254
2020	0.2551237741140418