Year	kg per 2011 PPP $ of GDP
1990	0.802905932649786
1991	0.792565199592273
1992	0.759190578977302
1993	0.73888980588005
1994	0.710833992075208
1995	0.706980803558283
1996	0.683288885001825
1997	0.649061280986046
1998	0.60671080114912
1999	0.577895194643014
2000	0.558016663196956
2001	0.542117050572539
2002	0.54931512402391
2003	0.586533507536057
2004	0.613902212291277
2005	0.623223846060928
2006	0.615928730576074
2007	0.590897275907236
2008	0.586695494775063
2009	0.577488426695474
2010	0.573309226143103
2011	0.589331873616619
2012	0.565380327792201
2013	0.53334567343208
2014	0.502445314652319