Year	kg per PPP $ of GDP
1990	0.4648231162370989
1991	0.4262321950778929
1992	0.41286979971039534
1993	0.4256956250040448
1994	0.4153391250928771
1995	0.41165779982518813
1996	0.3975178690816668
1997	0.39394045350831847
1998	0.37800595869819625
1999	0.37094322463849094
2000	0.3527402181581763
2001	0.34961575353515245
2002	0.3569585924195093
2003	0.3814727166274841
2004	0.35598500319300896
2005	0.3435690797442859
2006	0.346413919926447
2007	0.3292679666848599
2008	0.32602650251907495
2009	0.31461925035200183
2010	0.3157709133617782
2011	0.2885290726984263
2012	0.2974836579850629
2013	0.23930296086602404
2014	0.2267490479578237
2015	0.2206472791339269
2016	0.1997772860235651
2017	0.1917422160404612
2018	0.17187833824560597
2019	0.1670724042780718
2020	0.15399336084806395