Year	kg per PPP $ of GDP
1990	0.5397176540165621
1991	0.4727875574502527
1992	0.4449669250023935
1993	0.45146400150706895
1994	0.44904117103663654
1995	0.4529174650336672
1996	0.4761341633057351
1997	0.46081278994100106
1998	0.46044549158554016
1999	0.4685035504609105
2000	0.46317033225377396
2001	0.45237027120106704
2002	0.5065323992806926
2003	0.5194436852446774
2004	0.43972423930033394
2005	0.4079830942019018
2006	0.3606022629816565
2007	0.31157599620514825
2008	0.3081505762505074
2009	0.31948012179114127
2010	0.34459530588991594
2011	0.31607180178200006