Year	kg per PPP $ of GDP
1990	0.8881702925968938
1991	0.8587027636139275
1992	0.8411485420806056
1993	0.805669079221829
1994	0.77989613482644
1995	0.7659516521944314
1996	0.7442106838971659
1997	0.7224303631798299
1998	0.7220508826060688
1999	0.6959768754854802
2000	0.672049706830206
2001	0.6485874098786828
2002	0.6242389192910003
2003	0.594072339390219
2004	0.5782958369242057
2005	0.5532797632659853
2006	0.5249490307329542
2007	0.5034871323342115
2008	0.48595343648884526
2009	0.45041235538578495
2010	0.4564804940915269
2011	0.420127546809187
2012	0.40604143802986564
2013	0.36560802134073084
2014	0.3443665424101469
2015	0.34991844865488675
2016	0.3451168757333616
2017	0.3335322411773934
2018	0.3157272023735611
2019	0.29573489815721915
2020	0.2733078423330065