Year	kg per 2011 PPP $ of GDP
1990	0.425625144293911
1991	0.366542281389577
1992	0.317252325029122
1993	0.371371948757218
1994	0.397348366472726
1995	0.392197988806258
1996	0.361896178509696
1997	0.371206449363814
1998	0.462244978898672
1999	0.508583825012781
2000	0.431850575056757
2001	0.472930151360843
2002	0.581203339606442
2003	0.626110924631705
2004	0.418082197191141
2005	0.412354675072232
2006	0.385348994005739
2007	0.336089424219313
2008	0.355629723457102
2009	0.368778800394137
2010	0.393677117870614
2011	0.353415032807611
2012	0.376113128037463
2013	0.343412334856147
2014	0.359850084977907