Year	kg per 2021 PPP $ of GDP
1990	0.3922655137864587
1991	0.39741240037929176
1992	0.39720104051955246
1993	0.39232490729776237
1994	0.38316344291600535
1995	0.38759302580742855
1996	0.3743351927607839
1997	0.36256562221374405
1998	0.3587160075250371
1999	0.3457273878575717
2000	0.3397764197613985
2001	0.33778458984190785
2002	0.33480840930032535
2003	0.34196877380140284
2004	0.34357370836187673
2005	0.3443995366217655
2006	0.3409621252067814
2007	0.3339822028692618
2008	0.3263296564243242
2009	0.32694631122321477
2010	0.3277413856311648
2011	0.3303852929619557
2012	0.32384162465422855
2013	0.3174827680297725
2014	0.3077559719393557
2015	0.2929169159436203
2016	0.2822854681297665
2017	0.2760251131887832
2018	0.2736646228959136
2019	0.2668128138651717
2020	0.2654485737285205