Year	kg per 2011 PPP $ of GDP
1990	0.464186940116822
1991	0.429358755684875
1992	0.452958016493872
1993	0.427086402672394
1994	0.458329679244138
1995	0.429189792592037
1996	0.43997372748479
1997	0.432820696168441
1998	0.423872805906796
1999	0.410620926777411
2000	0.419279795155376
2001	0.411009704008353
2002	0.409991648273986
2003	0.407203758479074
2004	0.413097018363714
2005	0.418087332558784
2006	0.387928578917273
2007	0.374112057463292
2008	0.338022525421615
2009	0.328618287520801
2010	0.310756760916917
2011	0.309896002980692
2012	0.340567646395142
2013	0.3304535327192
2014	0.347613133534182