Year	kg per 2011 PPP $ of GDP
1990	0.495192387537479
1991	0.475151633350195
1992	0.486532544594595
1993	0.515696409419577
1994	0.504618068523192
1995	0.501681928675693
1996	0.502363242241986
1997	0.505111084883677
1998	0.453331618321765
1999	0.446380469316597
2000	0.458690211450544
2001	0.441413282977661
2002	0.424965005001867
2003	0.413372033311172
2004	0.40763933465332
2005	0.376507271314929
2006	0.36395826522159
2007	0.363449506260521
2008	0.36194515792641
2009	0.360303316555511
2010	0.376788255547697
2011	0.377954903110468
2012	0.36607805201209
2013	0.360972795823264
2014	0.346151285139504