Year	kg per PPP $ of GDP
1990	1.0092488801621073
1991	0.9467921562715519
1992	0.8985506617015059
1993	0.871227804370019
1994	0.8256803307604916
1995	0.7980816264477164
1996	0.7557061623642547
1997	0.7296970083230553
1998	0.7237722648715931
1999	0.7183709937969716
2000	0.6850711817035405
2001	0.6555696780226815
2002	0.6517567804393362
2003	0.619514244611447
2004	0.6084635878045949
2005	0.5792180934166988
2006	0.5451818201647373
2007	0.5190821351739041
2008	0.49446118111419535
2009	0.5210483333848258
2010	0.5023082625526631
2011	0.62873148848908
2012	0.6262933351146426
2013	0.42270534210383076
2014	0.4074986570112429
2015	0.33572623959471803
2016	0.3392102832094337
2017	0.425255164951651
2018	0.3960770568170521
2019	0.40533926574110335
2020	0.40414743610063353