Year	kg per 2011 PPP $ of GDP
1990	0.375766343443384
1991	0.353221524959082
1992	0.381617643675834
1993	0.386097267017071
1994	0.385920936413288
1995	0.38220394336317
1996	0.377425053374451
1997	0.382180970952841
1998	0.376677701111069
1999	0.356096454079687
2000	0.357676060777993
2001	0.377258537132623
2002	0.354765086641669
2003	0.369554349971451
2004	0.332700737624016
2005	0.308849174769504
2006	0.320803919948171
2007	0.306234560575343
2008	0.322180523162104
2009	0.300766175031526
2010	0.304571960081819
2011	0.291206785674017
2012	0.311568404889795
2013	0.26566019946912
2014	0.246285016343129