Year	kg per PPP $ of GDP
1991	0.9515189215518524
1992	1.037369330751776
1993	1.0344537709173918
1994	1.111937063954493
1995	1.0451113167456572
1996	0.9134662986489671
1997	0.8907088983077378
1998	0.5041464015932529
1999	0.3349386011437103
2000	0.33758039858493344
2001	0.3611686016930524
2002	0.36203309639118897
2003	0.4997043308309699
2004	0.34392067438964946
2005	0.3168870559000864
2006	0.28356101320575944
2007	0.25036762294698245
2008	0.2609709624594097
2009	0.2681696532312769
2010	0.28692354842219153
2011	0.27220843903774533
2012	0.26615387648517486
2013	0.26878084995978874
2014	0.27850791054948004
2015	0.37982554648844924
2016	0.4102290795926505
2017	0.39025025972881344
2018	0.347015649445758
2019	0.3581191197922012
2020	0.367162649759684