Year	kg per 2011 PPP $ of GDP
1990	0.085779276882205
1991	0.0790736428391385
1992	0.0746874538877004
1993	0.08250026584744
1994	0.158453315837407
1995	0.114453251921335
1996	0.105542874016992
1997	0.096241955379347
1998	0.0864597845128605
1999	0.086665867241767
2000	0.0828481961737223
2001	0.0768990043412843
2002	0.0679367446942031
2003	0.0650974656430815
2004	0.0614385712430881
2005	0.0561709311485452
2006	0.0514258233789456
2007	0.0504104983754088
2008	0.044153205922714
2009	0.0440806672119581
2010	0.042113379690062
2011	0.0439257129516454
2012	0.0448256193241237
2013	0.0466413883949817
2014	0.0453159808692618