Year	kg per 2011 PPP $ of GDP
1990	0.539000823451581
1991	0.536561289850549
1992	0.547662226856301
1993	0.544941359596717
1994	0.525443609012593
1995	0.512845984088899
1996	0.529261163068287
1997	0.515185222213338
1998	0.5105034266945
1999	0.498823581378074
2000	0.485994668825751
2001	0.470133665768374
2002	0.475018630999174
2003	0.454378455214552
2004	0.445016805066158
2005	0.440603599008638
2006	0.447199171683875
2007	0.438592798064089
2008	0.43882332661144
2009	0.440400912919037
2010	0.427183653702813
2011	0.417937041804659
2012	0.398454897570853
2013	0.372431301156822
2014	0.35237039933761