Year	kg per PPP $ of GDP
1990	1.486718169536355
1991	1.552816017426542
1992	1.4461966938673043
1993	1.364371119782673
1994	1.252970041054798
1995	1.147061043448096
1996	1.1116819643878055
1997	0.9979530901982847
1998	0.8680226526128185
1999	0.7959581476488814
2000	0.7243112513112522
2001	0.6901841375401127
2002	0.6366765893452957
2003	0.6341424383605304
2004	0.5920008948987826
2005	0.5681860781955115
2006	0.543483206632312
2007	0.48913018230698235
2008	0.4418348933259229
2009	0.40497966336130903
2010	0.39483516110628514
2011	0.36012873327004113
2012	0.3378538482886568
2013	0.32244487634575486
2014	0.296918579178996
2015	0.28371608103683627
2016	0.28033082698524836
2017	0.27492522699892036
2018	0.2563267504476357
2019	0.2189155564463848
2020	0.2028400004702114