Year	kg per PPP $ of GDP
1990	1.775961805672293
1991	2.141121028204767
1992	2.010007662553016
1993	1.8691044347128343
1994	1.5606823988846539
1995	1.4302696017118741
1996	1.1619046189529845
1997	1.0776943742134204
1998	1.0348759142815431
1999	0.9967411001537452
2000	1.0072950887876349
2001	0.9540660793757519
2002	0.9604154386010265
2003	0.8533815048183381
2004	0.7713112412590716
2005	0.806447260001762
2006	0.8093600593941614
2007	0.7494260500475941
2008	0.6727252067479633
2009	0.7118540981805186
2010	0.6938286073208365
2011	0.6370282345060894
2012	0.594615038964796
2013	0.607286344837508
2014	0.5610766943661558
2015	0.5465212441223397
2016	0.5597116153816721
2017	0.5602524081779644
2018	0.5452287041877659
2019	0.5206625868577215
2020	0.46498460884051235