Year	kg per 2011 PPP $ of GDP
1990	0.325744433632545
1991	0.334978802525882
1992	0.323665068553169
1993	0.3416220936916
1994	0.344274670890677
1995	0.35744914023339
1996	0.346688727035523
1997	0.348753023071685
1998	0.331826224594577
1999	0.327129132326285
2000	0.340655457710595
2001	0.331080774803005
2002	0.309825199795093
2003	0.325232248917053
2004	0.336502172342457
2005	0.303955650021761
2006	0.300372543663446
2007	0.291706887303546
2008	0.289409913728042
2009	0.275489044610689
2010	0.261161224210357
2011	0.253343840231607
2012	0.246592505202226
2013	0.23921649632853
2014	0.239187467486229