Year	kg per PPP $ of GDP
1990	0.9267762936191303
1991	0.8832067320924872
1992	0.8304525134525657
1993	0.7865670982278189
1994	0.7328302292309072
1995	0.7175978930557549
1996	0.6700810959768462
1997	0.6357568090201076
1998	0.6278194829122008
1999	0.5974579614945927
2000	0.576456866877393
2001	0.5603633476281983
2002	0.5472726134025281
2003	0.5499234520998233
2004	0.538570815723301
2005	0.5230381900790853
2006	0.5007692124935703
2007	0.4773489846389303
2008	0.45576375468302777
2009	0.4464273243871338
2010	0.4395399872135389
2011	0.4330768936252997
2012	0.4149596306479597
2013	0.4032741899409826
2014	0.3907862709211272
2015	0.3770392008253389
2016	0.36121771418703885
2017	0.349032426987574
2018	0.33686180657715864
2019	0.32057658497525515
2020	0.3103369009450044