Year	kg per PPP $ of GDP
1990	0.5375928816439154
1991	0.5544221793829366
1992	0.5300338328390266
1993	0.5140550691765974
1994	0.4969178096987179
1995	0.4867127792472351
1996	0.466223069220196
1997	0.46620094366885856
1998	0.4431785708778805
1999	0.4327127453176972
2000	0.42399308134586355
2001	0.4021870669761256
2002	0.39428973068490075
2003	0.36805172263737207
2004	0.3563569378208447
2005	0.33513631675245764
2006	0.321703680509648
2007	0.32002592001373614
2008	0.32454528252681447
2009	0.328542400077408
2010	0.3173566043574576
2011	0.3126779908528338
2012	0.3098358066529569
2013	0.30355606029481025
2014	0.3151574623490025
2015	0.29953487792309813
2016	0.281603711961019
2017	0.27634763652093575
2018	0.2663018065894598
2019	0.2440338143595398
2020	0.22524117578913722