Year	kg per 2011 PPP $ of GDP
1990	0.419643069846772
1991	0.473751406020163
1992	0.475234406791112
1993	0.503039764002157
1994	0.487372233777519
1995	0.491739368488787
1996	0.492059334389657
1997	0.47043331676197
1998	0.459856609002557
1999	0.470441543839284
2000	0.475859516462104
2001	0.492511908022331
2002	0.316678787912611
2003	0.293724338263833
2004	0.273928801919348
2005	0.26767084045622
2006	0.276842710171835
2007	0.266178428599289
2008	0.281609380597616
2009	0.28161353654493
2010	0.321240265194651
2011	0.248813931208846
2012	0.277940276489127
2013	0.229253497354563
2014	0.237413761870719