Year	kg per 2011 PPP $ of GDP
1999	0.394030761688842
2000	0.401286696255143
2001	0.417040394356679
2002	0.418734473632281
2003	0.380848274149099
2004	0.373419172769877
2005	0.345389239020512
2006	0.331542205232302
2007	0.292361757787968
2008	0.319274895528629
2009	0.333110300668975
2010	0.338969779161317
2011	0.572722775842602
2012	0.340585258305342
2013	0.42100242920018
2014	0.561134882143798