Year	kg per 2011 PPP $ of GDP
1990	0.346098909735376
1991	0.334042755566669
1992	0.324979510591985
1993	0.312148068008729
1994	0.283041529126866
1995	0.297952368650679
1996	0.316840367271624
1997	0.288028254844419
1998	0.249372478407132
1999	0.25333409512659
2000	0.255817054986373
2001	0.251703941636984
2002	0.349957642578669
2003	0.362025908495647
2004	0.366988254361501
2005	0.381404307237011
2006	0.2489447632011
2007	0.351119098653025
2008	0.325160673711618
2009	0.340243146785707
2010	0.233193616172406
2011	0.216892104892642
2012	0.338315073793566
2013	0.323508653074513
2014	0.319205719493141