Year	kg per 2011 PPP $ of GDP
1990	0.34660502899886
1991	0.372939182723668
1992	0.372946340238087
1993	0.398724165546142
1994	0.398741628151633
1995	0.368477714310516
1996	0.410802413042799
1997	0.43910572286842
1998	0.477069351205381
1999	0.463060720178102
2000	0.51018411994229
2001	0.50727178232589
2002	0.516810582575292
2003	0.515932810142048
2004	0.537727248363676
2005	0.500723580127377
2006	0.536556042252013
2007	0.55905720334113
2008	0.568406780584605
2009	0.59926262645548
2010	0.562932972029142
2011	0.556222037597669
2012	0.537631458098814
2013	0.522682329426827
2014	0.526668911934803