Year	kg per 2011 PPP $ of GDP
1992	1.16287755336331
1993	1.30277274022053
1994	1.40554050374686
1995	1.26545581255556
1996	1.17143203535038
1997	1.05590563907726
1998	1.02001955817919
1999	0.856832028182491
2000	0.796362792881259
2001	0.706525060735237
2002	0.664513477313731
2003	0.623343795332964
2004	0.598018070192507
2005	0.500078953194215
2006	0.424205138238075
2007	0.263372799816334
2008	0.277134867880011
2009	0.227692699885408
2010	0.208945350638792
2011	0.231442466293471
2012	0.240729777712303
2013	0.228004108402796
2014	0.233277635901654