Year	kg per 2011 PPP $ of GDP
1990	0.577071307543659
1991	0.573418861887781
1992	0.588748777746334
1993	0.557051593246415
1994	0.536845415892295
1995	0.535374085800754
1996	0.581564212454167
1997	0.536516647551358
1998	0.53536163669877
1999	0.567397230014106
2000	0.568901867651473
2001	0.596324728785984
2002	0.58728175131391
2003	0.595737716447229
2004	0.590470676392154
2005	0.618117831145995
2006	0.631595843454131
2007	0.624280067285783
2008	0.611483172957512
2009	0.618697045013716
2010	0.637720134121274
2011	0.625508868495347
2012	0.60411586969684
2013	0.616387360089469
2014	0.601042179601035