Year	kg per 2021 PPP $ of GDP
1990	0.7927423522208387
1991	0.7733381741051601
1992	0.780163805362795
1993	0.7333008390178438
1994	0.7044528417861868
1995	0.6994097808071045
1996	0.6915491897303966
1997	0.626800718610645
1998	0.5604124930063624
1999	0.5207232244000249
2000	0.4743518645495991
2001	0.4422824372361857
2002	0.4213060521354668
2003	0.39946382521873397
2004	0.3804488182103505
2005	0.3521955058963196
2006	0.33338698110937914
2007	0.29932534770392094
2008	0.2853833072959027
2009	0.27037055228217216
2010	0.2695264098019853
2011	0.24279056351172518
2012	0.24454452533011323
2013	0.24273466489582093
2014	0.2367853380474875
2015	0.22732124979268578
2016	0.23461476404883533
2017	0.23315609606048718
2018	0.23819154836568998
2019	0.22849577345059782
2020	0.21855894847105947