Year	kg per 2011 PPP $ of GDP
1990	0.524830816959144
1991	0.362468971950509
1992	0.38036927769997
1993	0.387282232519855
1994	0.389504905672175
1995	0.39115396352921
1996	0.356136569587502
1997	0.400791701825151
1998	0.411354968155513
1999	0.40961173116482
2000	0.373718900881537
2001	0.381712050888647
2002	0.365228166587029
2003	0.401968780496513
2004	0.349412357649622
2005	0.328114328065974
2006	0.28780784438619
2007	0.245062845856089
2008	0.287070957096955
2009	0.31603371801176
2010	0.280959734943305
2011	0.283904674654727
2012	0.30598345041302
2013	0.297497448761389
2014	0.311246824108014