Year	kg per 2021 PPP $ of GDP
1990	0.35674518879904077
1991	0.3561320061208462
1992	0.35082229395213543
1993	0.3480385416517712
1994	0.3413800852948119
1995	0.34075270598952745
1996	0.3357551207575945
1997	0.329111144315487
1998	0.3233252617906252
1999	0.31441331855471555
2000	0.30960707147889766
2001	0.30690410710101734
2002	0.30296838091502876
2003	0.305607146316275
2004	0.3040469310705365
2005	0.3018916231339608
2006	0.29652720881744027
2007	0.2925826451001577
2008	0.2866759606910747
2009	0.285088316178092
2010	0.2879378100114483
2011	0.2856046513941656
2012	0.2801124721009171
2013	0.27667462583633173
2014	0.26867676019163794
2015	0.25860293506517984
2016	0.2510219331778858
2017	0.24564759962761737
2018	0.24297207803586193
2019	0.23557128168004288
2020	0.22950864800966556