Year	kg per PPP $ of GDP
1990	0.614063559982433
1991	0.588988606676752
1992	0.5651569832042577
1993	0.549893819445979
1994	0.5310929483307257
1995	0.5130921666855752
1996	0.5029787175843817
1997	0.4878626474163353
1998	0.471663517785309
1999	0.45270938297679675
2000	0.4339587254904099
2001	0.4181752171865637
2002	0.3997864649749847
2003	0.39221828054243024
2004	0.37342583879324664
2005	0.3553277264734576
2006	0.3290259714004331
2007	0.3153139952889831
2008	0.2971916610264561
2009	0.28573437091339676
2010	0.28461560098721694
2011	0.26691820613971323
2012	0.25459405902345106
2013	0.24544009587985222
2014	0.23238960997292474
2015	0.22329563250429277
2016	0.2133877074887123
2017	0.20375473980327288
2018	0.19547721490505574
2019	0.1803586591049629
2020	0.16674400592000777