Year	kg per 2011 PPP $ of GDP
1992	0.759427832591993
1993	0.728503810806692
1994	0.671093165632247
1995	0.622224083566279
1996	0.604473995722211
1997	0.617960784227287
1998	0.596302321158679
1999	0.53717972058345
2000	0.569828491605296
2001	0.553148197754462
2002	0.526688995320986
2003	0.518179918789725
2004	0.472560656434135
2005	0.456241287773941
2006	0.434082810476659
2007	0.415077219912296
2008	0.382450926057647
2009	0.370755101700333
2010	0.375713244814337
2011	0.353694288216312
2012	0.336941814203329
2013	0.330689765989538
2014	0.314769885125195