Year	kg per 2011 PPP $ of GDP
1990	0.297333887537608
1991	0.328970801387226
1992	0.331668840047278
1993	0.367636978263608
1994	0.345024616222967
1995	0.404774858161312
1996	0.380856406133241
1997	0.353302896303982
1998	0.348878156153075
1999	0.310705606708906
2000	0.332489659951886
2001	0.356785695853592
2002	0.333848674376656
2003	0.373424551718273
2004	0.362011198029553
2005	0.366048505521809
2006	0.333207612076182
2007	0.345451796153838
2008	0.363790305783473
2009	0.360046886863465
2010	0.368193305222795
2011	0.352768675617316
2012	0.33188562519604
2013	0.342811290088016
2014	0.332015421644116