Year	kg per 2011 PPP $ of GDP
1990	0.327949651996459
1991	0.333784975448498
1992	0.322363685122177
1993	0.323419187093342
1994	0.315110362382805
1995	0.330192972921085
1996	0.331912904816371
1997	0.305240560132273
1998	0.291848684915762
1999	0.270426427406086
2000	0.259296046300326
2001	0.258203513080877
2002	0.26474052016643
2003	0.265118781548281
2004	0.263709957618814
2005	0.253719371159453
2006	0.242744420322805
2007	0.23007990223091
2008	0.225613117257423
2009	0.228049302399463
2010	0.238972919251811
2011	0.223900381883052
2012	0.221220514429249
2013	0.225338672449577
2014	0.214544164645891