Year	kg per PPP $ of GDP
1990	1.141386272665051
1991	1.0860703630731414
1992	1.007036147780472
1993	0.9704454964454935
1994	0.903560789259474
1995	0.8993810448287787
1996	0.8174302665742748
1997	0.7754437091165088
1998	0.776877257206894
1999	0.7161254752994304
2000	0.6882756543326277
2001	0.6666185921704871
2002	0.6514930932469568
2003	0.6747261963264574
2004	0.6888994696231651
2005	0.6852130622466525
2006	0.6588958260843666
2007	0.6201483793859948
2008	0.5788669790458415
2009	0.5682139899086316
2010	0.561122912612588
2011	0.5532571308346611
2012	0.5185007060079488
2013	0.5043454949461684
2014	0.48116366314141834
2015	0.45758154639437404
2016	0.43440624688122015
2017	0.4182578245909914
2018	0.40427703248807856
2019	0.3842638405271058
2020	0.37880745023642376