Year	kg per 2011 PPP $ of GDP
1992	0.827704415585514
1993	0.845129695932675
1994	0.846920112541848
1995	0.848724428949669
1996	0.871834539071273
1997	0.813446086582781
1998	0.841799940195518
1999	0.810012607425265
2000	0.749248857217449
2001	0.712711501428608
2002	0.680533510291246
2003	0.653443005427942
2004	0.608747207479525
2005	0.576764105069854
2006	0.550932793227792
2007	0.507049443503701
2008	0.495892487294629
2009	0.493645254616742
2010	0.501344317638569
2011	0.507398547753393
2012	0.50800291549673
2013	0.484773723919467
2014	0.461586675565661