Year	kg per PPP $ of GDP
1990	0.5119832715695998
1991	0.6016345453110283
1992	0.5175245346472025
1993	0.5799428091815961
1994	0.6231063312717935
1995	0.6139541432194081
1996	0.6351008020780057
1997	0.5822650060421386
1998	0.5403465057966829
1999	0.5591078639680116
2000	0.5002269633806169
2001	0.47060033296146686
2002	0.49037719917424055
2003	0.4957106073044743
2004	0.43206647092931055
2005	0.4051003651026742
2006	0.35514582271145295
2007	0.33365914100318467
2008	0.2962998574628763
2009	0.26812318301522
2010	0.24843174760487843
2011	0.24151472367062543
2012	0.24202926255365287
2013	0.23604328307364203
2014	0.2573409083818792
2015	0.3544197594848729
2016	0.3908220099650887
2017	0.3458099862110715
2018	0.30672565156811504
2019	0.31546965907952695
2020	0.3815425116394799