Year	kg per 2011 PPP $ of GDP
1990	0.318615562112719
1991	0.329930179456195
1992	0.331748717674375
1993	0.329672911552573
1994	0.329772907695694
1995	0.326347112191562
1996	0.332942259810093
1997	0.332909905434405
1998	0.321449102634469
1999	0.316575932126704
2000	0.316612920171637
2001	0.307761685848856
2002	0.301857018322314
2003	0.293635675250548
2004	0.288101028870029
2005	0.282514877670458
2006	0.279827671273595
2007	0.28135369975471
2008	0.300902373959029
2009	0.309039383739416
2010	0.286219944295917
2011	0.290723830638043
2012	0.299612558119826
2013	0.284833217926892
2014	0.291008348893547