Year	kg per PPP $ of GDP
1990	0.6465068615310412
1991	0.5620924399682432
1992	0.5150889464329779
1993	0.6230550091819289
1994	0.5158187802202182
1995	0.4507982817048198
1996	0.4174392483016039
1997	0.4165391316801681
1998	0.379950638941843
1999	0.3669928267583918
2000	0.29732555847863806
2001	0.3420323312440741
2002	0.2930415743506817
2003	0.3126156714664182
2004	0.30049961621515486
2005	0.29156037953740604
2006	0.28042544975905026
2007	0.26638384826249434
2008	0.2509047885838224
2009	0.228342472328594
2010	0.21730232170799782
2011	0.2133591847635022
2012	0.2137829978918875
2013	0.17239423311113916
2014	0.15789287600612054
2015	0.0994160628739015
2016	0.07479699064097854
2017	0.07474092356010711
2018	0.06983608996538182
2019	0.06538087863935677
2020	0.06726413591850423