Year	kg per PPP $ of GDP
1990	0.7115890697978627
1991	0.7479728740138024
1992	0.6778703037837078
1993	0.67038061350195
1994	0.6310424934842863
1995	0.6052901745400441
1996	0.6063792220397188
1997	0.5637911441311735
1998	0.5372569025612531
1999	0.520238919568739
2000	0.45133647287971407
2001	0.4181416547032931
2002	0.37677507114585473
2003	0.3710985399513152
2004	0.3426847186253245
2005	0.32404384411704806
2006	0.29953006005824345
2007	0.28039549975878236
2008	0.2548681968315605
2009	0.23033895769584192
2010	0.22025216260350655
2011	0.20426151208835092
2012	0.18814191032529262
2013	0.16784735358580977
2014	0.16026691540774315
2015	0.16446960392293333
2016	0.16135935474353766
2017	0.17127995993955186
2018	0.15773844011928734
2019	0.13759652935983996
2020	0.1310780554257956