Year	kg per 2011 PPP $ of GDP
1990	0.892795308995143
1991	1.19030384244072
1992	1.18869955404836
1993	1.03437013521059
1994	0.866760705788453
1995	0.812173202277751
1996	0.806554161568747
1997	0.744090579156845
1998	0.720041644730239
1999	0.684633731925303
2000	0.672604759314714
2001	0.686187445697828
2002	0.688698746975848
2003	0.623965594079999
2004	0.600332609029571
2005	0.560451621010135
2006	0.566468282998153
2007	0.65981409202263
2008	0.604598721444616
2009	0.666459952671528
2010	0.660948733282775
2011	0.876592329012636
2012	0.952026153539473
2013	1.25996843863352
2014	0.628033115650081