Year	kg per 2011 PPP $ of GDP
1990	0.335707385088424
1991	0.357265598770022
1992	0.360782529484983
1993	0.376784192335055
1994	0.368482213671202
1995	0.324042204770614
1996	0.352966805445782
1997	0.339424457015707
1998	0.349702992007293
1999	0.331531831512081
2000	0.340035069502472
2001	0.323125430938852
2002	0.319536743665156
2003	0.343562432682471
2004	0.309626343084802
2005	0.302087470300028
2006	0.299486729765637
2007	0.299851341359681
2008	0.302763063168262
2009	0.292212818437838
2010	0.274022138360326
2011	0.262923507748569
2012	0.252266230862123
2013	0.230188678461285
2014	0.237705517843086