Year	kg per 2011 PPP $ of GDP
1990	1.41368067348435
1991	1.35869011410315
1992	1.24747169525106
1993	1.17219604379892
1994	1.10153332607256
1995	1.07789631827865
1996	1.02271700398887
1997	0.938026191537522
1998	0.833455796040614
1999	0.772637233862667
2000	0.730863513648024
2001	0.690923924610756
2002	0.698959698616348
2003	0.749071967979934
2004	0.784136468981621
2005	0.793150312917067
2006	0.77910245616487
2007	0.734425363098611
2008	0.719516834109668
2009	0.696699681784574
2010	0.690720670245516
2011	0.699292010720417
2012	0.667987133320374
2013	0.634015112978174
2014	0.592837313988998