Year	kg per PPP $ of GDP
1990	0.8701703399370836
1991	0.8359153768350374
1992	0.8000346577638553
1993	0.7653519557456893
1994	0.7218615803774215
1995	0.7093357052220277
1996	0.6669102729259864
1997	0.632360834726621
1998	0.6240024565338285
1999	0.592103999129013
2000	0.5675892139393973
2001	0.5513124498372247
2002	0.5387367488391706
2003	0.5407201678826592
2004	0.5280403089152053
2005	0.5117028800790122
2006	0.48458676254454525
2007	0.460374141089189
2008	0.4351144231179487
2009	0.4298681082598607
2010	0.4239768951295381
2011	0.41614817897191414
2012	0.39945640552947037
2013	0.38796425827005754
2014	0.3769708606536621
2015	0.36572737594164606
2016	0.3501136113376038
2017	0.3369380146422914
2018	0.3243725805993543
2019	0.3075537485370359
2020	0.2975125403336738