Year	kg per PPP $ of GDP
1990	0
1991	0
1992	0.7522294648416518
1993	0.7346650563699217
1994	0.7081481643602916
1995	0.6706223669992676
1996	0.7405471770592464
1997	0.7764857601163415
1998	0.7912963282429544
1999	0.7908099381910388
2000	0.8124624117311637
2001	0.7690977922308234
2002	0.7973800639163569
2003	0.7799793536134517
2004	0.8004079424533089
2005	0.759910331621164
2006	0.7732985657011336
2007	0.7699635099257744
2008	0.8247577684616637
2009	0.8141887303520517
2010	0.7823081167945651
2011	0.7697762502532424
2012	0.7543297989549825
2013	0.7328562993602548
2014	0.7379651325428941
2015	0.7270702679798037
2016	0.7060701876377273
2017	0.6814613607452263
2018	0.6381188484067423
2019	0.5731980408595805
2020	0.42057057037171247