Year	kg per 2011 PPP $ of GDP
1990	0.918905462133643
1991	0.775519626626065
1992	0.787740667857044
1993	1.00101173923333
1994	0.784661778310363
1995	0.816970273078921
1996	0.79104655383699
1997	0.729858890524921
1998	0.651475048533399
1999	0.638459654927225
2000	0.603166629047223
2001	0.620276499238703
2002	0.562586658688261
2003	0.567042878665734
2004	0.527059163050132
2005	0.503729854907199
2006	0.481897571651381
2007	0.478832547142835
2008	0.438546070798671
2009	0.382472509850371
2010	0.390289405948459
2011	0.428382459904705
2012	0.387993010743712
2013	0.341973691241498
2014	0.359684788233857