Year	kg per 2011 PPP $ of GDP
1990	0.30149694833248
1991	0.325850710323017
1992	0.321124379642023
1993	0.330507884823526
1994	0.347451484756335
1995	0.352922560286113
1996	0.337157358324514
1997	0.322851037175367
1998	0.33975806479956
1999	0.352212890560963
2000	0.338603987216287
2001	0.340723593035873
2002	0.330861527037533
2003	0.345291072890495
2004	0.339363148442807
2005	0.344686317512155
2006	0.337424439235321
2007	0.319522251871447
2008	0.329772081316496
2009	0.333717647590449
2010	0.323928619493365
2011	0.332281735587133
2012	0.339237395177541
2013	0.338437617542446
2014	0.338101860101556