Year	kg per 2021 PPP $ of GDP
1990	1.342149854141908
1991	1.391792024937789
1992	1.4084756770183795
1993	1.3705382577669858
1994	1.407052027958152
1995	1.3970947654648505
1996	1.3365206759021118
1997	1.2157808478910086
1998	1.1951484789783766
1999	1.2036424956967757
2000	1.1583554836903696
2001	1.1315106896547418
2002	1.0783247032608292
2003	1.0475120507728772
2004	0.95198007131794
2005	0.8897226253325166
2006	0.8544041041838082
2007	0.8102935055919834
2008	0.7957839166693115
2009	0.7734415660633271
2010	0.7635438780608663
2011	0.7487561189760366
2012	0.7162433628671778
2013	0.6671006179237758
2014	0.6365100536952457
2015	0.6103114208634166
2016	0.6027099969183753
2017	0.5858100602584211
2018	0.5822756270533863
2019	0.5703435302527808
2020	0.5555919272558407