Year	kg per 2011 PPP $ of GDP
1990	0.426310382277568
1991	0.418712692197594
1992	0.40854570534245
1993	0.387403410362141
1994	0.391219436620382
1995	0.428071269621116
1996	0.453042849745847
1997	0.47853283162816
1998	0.469932832808894
1999	0.477520627226448
2000	0.489018115760112
2001	0.496947654565643
2002	0.470050345057317
2003	0.472258180401342
2004	0.466248673505524
2005	0.454654504075113
2006	0.48382244486899
2007	0.40046038399622
2008	0.427053828138975
2009	0.338497945642941
2010	0.323816399731184
2011	0.34279696976041
2012	0.327535229057632
2013	0.353438113437532
2014	0.321916571676123