Year	kg per 2011 PPP $ of GDP
1990	0.50121240027975
1991	0.502007433951174
1992	0.51407936423417
1993	0.505981187415041
1994	0.496462963886161
1995	0.494864892715827
1996	0.499250647436434
1997	0.494614324653539
1998	0.486859288479942
1999	0.471059986283719
2000	0.464369311414268
2001	0.450697630470967
2002	0.430378674676045
2003	0.450252133128795
2004	0.436055639400209
2005	0.426515351388163
2006	0.405429918704518
2007	0.404891570578458
2008	0.405678453841821
2009	0.39984180362951
2010	0.386345929530455
2011	0.376269880214437
2012	0.356223010268909
2013	0.347911585943253
2014	0.35131114776612