Year	kg per 2011 PPP $ of GDP
1990	0.290168536426849
1991	0.30162633723559
1992	0.300375211446609
1993	0.314750696148567
1994	0.333858675495769
1995	0.354679107910675
1996	0.347160509849997
1997	0.308875081856302
1998	0.36003544257051
1999	0.300113942123621
2000	0.27593213539556
2001	0.256771676241061
2002	0.259552745512947
2003	0.246609006385222
2004	0.228523272700662
2005	0.261528688657717
2006	0.242312185430699
2007	0.253737100436132
2008	0.249706221569784
2009	0.270646414379943
2010	0.256375226941245
2011	0.253370959084812
2012	0.262898942871394
2013	0.264630435017029
2014	0.275703979148498