Year	kg per PPP $ of GDP
1990	2.9192671838908275
1991	2.8883698107232725
1992	2.7982452012706016
1993	2.573780403120155
1994	2.5291979431580436
1995	2.4065207049900685
1996	2.2246927759930797
1997	1.976512591697799
1998	2.237492768210478
1999	2.2206207717868964
2000	2.069843154817865
2001	1.9780409028325694
2002	1.8936895640318585
2003	1.8367855154041028
2004	1.6171593763465097
2005	1.4687482388780155
2006	1.3337904423157163
2007	1.2190107954262048
2008	1.138265627295092
2009	1.0758549813159277
2010	1.0277969628929629
2011	0.9769571866157805
2012	0.9054413279857851
2013	0.8091223634546599
2014	0.7501617532759031
2015	0.7110653299496899
2016	0.6872728433847044
2017	0.6634975629498353
2018	0.6540835862772131
2019	0.614306153538772
2020	0.5801175602811798