Year	kg per PPP $ of GDP
1990	1.6142392996590036
1991	1.576895157525154
1992	1.5625337497471539
1993	1.384508297628525
1994	1.2385100243088583
1995	1.2004678125897739
1996	1.176682936195716
1997	1.1508764829388043
1998	1.1575261647272923
1999	1.1156044986838851
2000	1.0438412343960846
2001	1.060857303070763
2002	1.0488633408633217
2003	1.1171211056127237
2004	1.0818109144255739
2005	1.0621126614461398
2006	1.0842292175557189
2007	1.0350097313585669
2008	0.9434330087080836
2009	0.893640109855823
2010	0.9283860042438988
2011	0.9222633554503264
2012	0.8878378348574689
2013	0.8919602450602131
2014	0.8578882890446905
2015	0.8248929239219215
2016	0.7832590681934655
2017	0.7107067288506194
2018	0.7053269098871382
2019	0.6552678751510642
2020	0.625860371017701