Year	kg per 2011 PPP $ of GDP
1990	0.300542866686889
1991	0.324819561637628
1992	0.320108187344679
1993	0.329461998593575
1994	0.346351980810532
1995	0.351741558123669
1996	0.336095853009187
1997	0.321685552357317
1998	0.338484396753134
1999	0.350826559175588
2000	0.337538412377627
2001	0.340022070552967
2002	0.330303471033861
2003	0.344598223286218
2004	0.33882258113708
2005	0.344301036720712
2006	0.336996376287339
2007	0.319125193476559
2008	0.329216323639148
2009	0.333071305489168
2010	0.323241780245589
2011	0.331445880541193
2012	0.338289704550448
2013	0.337534844115824
2014	0.337237994098472