Year	kg per 2011 PPP $ of GDP
1992	0.715966988582855
1993	0.681907149450633
1994	0.605222171226188
1995	0.595774413661298
1996	0.547423749895513
1997	0.5128102321951
1998	0.486203905981382
1999	0.472285480111531
2000	0.426737955745943
2001	0.453009843223246
2002	0.432236668045972
2003	0.4125470516286
2004	0.384548327688569
2005	0.365888328668804
2006	0.335201877896141
2007	0.284543806520317
2008	0.276200144043876
2009	0.263582007395879
2010	0.267178299738883
2011	0.247547710908778
2012	0.231097487009815
2013	0.229971349644739
2014	0.207495776402842