Year	kg per 2011 PPP $ of GDP
1990	0.71013693323331
1991	0.675418312904351
1992	0.554510096396782
1993	0.563371618135626
1994	0.526641959379611
1995	0.5310685879698
1996	0.531766061513768
1997	0.512923575945904
1998	0.517697097540989
1999	0.51449699667838
2000	0.62936327348329
2001	0.656631425411957
2002	0.687120847683241
2003	0.708259830527779
2004	0.670417986743588
2005	0.68834991898461
2006	0.680275207203945
2007	0.694397932252443
2008	0.65440983537348
2009	0.723275520595163
2010	0.716385714599569
2011	0.690496144344123
2012	0.377759213539845
2013	0.231512666859963
2014	0.232496051547685