Year	kg per 2011 PPP $ of GDP
1990	0.524895814453875
1991	0.525186236510567
1992	0.516649121936914
1993	0.515009364059393
1994	0.50153007411805
1995	0.492116979440117
1996	0.485238846760794
1997	0.474892252520192
1998	0.457257379063173
1999	0.444886761755168
2000	0.441922686252773
2001	0.430031603044052
2002	0.426107872927167
2003	0.416780706801598
2004	0.407213132158226
2005	0.395692327240375
2006	0.378566554446389
2007	0.37757867331514
2008	0.36667067033544
2009	0.352719441119719
2010	0.352528831362079
2011	0.340334753127887
2012	0.322134781320056
2013	0.318762543365477
2014	0.316869932764324