Year	kg per PPP $ of GDP
1990	0.32971618062316677
1991	0.3040420050124736
1992	0.3073278151854653
1993	0.30620172876846397
1994	0.3026916789233228
1995	0.2936562288741834
1996	0.2985543159135157
1997	0.2935170942869402
1998	0.2998156282499803
1999	0.3145758765779273
2000	0.30354729982585926
2001	0.30583275408896726
2002	0.3320462532086063
2003	0.30623305692498853
2004	0.290836591195412
2005	0.2808266086455882
2006	0.2819657867530159
2007	0.284964379265217
2008	0.2891744634318124
2009	0.3061046258164386
2010	0.3159693232194247
2011	0.28994219199456644
2012	0.2932992023773025
2013	0.29903010561371945
2014	0.31329112693859695
2015	0.36404494094153395
2016	0.37576746256321947
2017	0.34636211106744647
2018	0.30813394009218315
2019	0.31184037163620953
2020	0.3582351886032897