Year	kg per 2011 PPP $ of GDP
1990	0.0391701599324916
1991	0.0362723400217851
1992	0.0381085446128717
1993	0.0378526353103651
1994	0.0370622336948423
1995	0.0373069180474643
1996	0.036209364479802
1997	0.0371384483759739
1998	0.0502172760349638
1999	0.0495644950074628
2000	0.051194493841021
2001	0.0447679589651295
2002	0.044379826327689
2003	0.0404949540056349
2004	0.0414331820769596
2005	0.0398680623905352
2006	0.0399578730967803
2007	0.0413131556440239
2008	0.0418685153322859
2009	0.0301347472055424
2010	0.0341746900073407
2011	0.0358710951189556
2012	0.0343966235323919
2013	0.0347387111501364
2014	0.0446227860611535