Year	kg per 2011 PPP $ of GDP
1990	0.524967695795608
1991	0.54102616342483
1992	0.553638801637596
1993	0.541768236208852
1994	0.5239115376288
1995	0.524022299578063
1996	0.512183382120669
1997	0.487780831241511
1998	0.471064981928761
1999	0.461361593690582
2000	0.445154143040344
2001	0.438155114865021
2002	0.436663359675533
2003	0.451639373869331
2004	0.452445425468791
2005	0.451300122894029
2006	0.445683949330395
2007	0.430647404696594
2008	0.433963368117521
2009	0.433534601320346
2010	0.429414202771826
2011	0.438119325101851
2012	0.431611226156307
2013	0.412813459433339
2014	0.399173400680383