Year	kg per 2011 PPP $ of GDP
1990	0.294171979557469
1991	0.304225129548296
1992	0.313393118315302
1993	0.313428093311557
1994	0.298084792403391
1995	0.289455155474076
1996	0.294894567034024
1997	0.312999882408363
1998	0.300593018897125
1999	0.309824692351193
2000	0.304229067732197
2001	0.307104761919606
2002	0.282755749397555
2003	0.277584483055589
2004	0.270524672043717
2005	0.258688471518008
2006	0.246428517506477
2007	0.240584362866196
2008	0.247116533257893
2009	0.234502760306435
2010	0.226633321023354
2011	0.219521916377502
2012	0.232789050111415
2013	0.222338699901112
2014	0.222103621256083