Year	kg per 2011 PPP $ of GDP
1992	0.926495769487044
1993	0.842269122903902
1994	0.761217028182044
1995	0.585404433620281
1996	0.687438549467386
1997	0.616163869998264
1998	0.640430802043468
1999	0.484687757767274
2000	0.456130582244926
2001	0.363872513636754
2002	0.463315464341719
2003	0.474826040387926
2004	0.479251086642547
2005	0.457018209428592
2006	0.436578875562033
2007	0.48416109795069
2008	0.516052811794474
2009	0.4446713654911
2010	0.42000047897937
2011	0.475395240734413
2012	0.630339726459233
2013	0.552134340529279
2014	0.518239127947206