Year	kg per 2011 PPP $ of GDP
1990	0.302201392785032
1991	0.320213389247724
1992	0.325322679717772
1993	0.345397207425364
1994	0.353955285364102
1995	0.337517665377239
1996	0.322339134260418
1997	0.30318251057952
1998	0.317409527272894
1999	0.332205379388586
2000	0.342788735808916
2001	0.343503471281609
2002	0.341709805518792
2003	0.346393163779699
2004	0.346746061487131
2005	0.346523394439708
2006	0.3469622037582
2007	0.327451433427735
2008	0.339085121927746
2009	0.351733088570474
2010	0.348071461968168
2011	0.341523081876971
2012	0.354055418544694
2013	0.342229447755592
2014	0.352990617942278