Year	kg per 2011 PPP $ of GDP
1990	0.236956581809097
1991	0.630747980752014
1992	0.616081566337011
1993	0.506852109637825
1994	0.549444449609265
1995	0.560773094775201
1996	0.472171712300852
1997	0.382780406938286
1998	0.300724497458606
1999	0.25544566372696
2000	0.252464998522117
2001	0.290707559034033
2002	0.319270709353652
2003	0.498340144281785
2004	0.404746381376804
2005	0.385779221790081
2006	0.304695534388802
2007	0.189137138528694
2008	0.261899675706638
2009	0.284335236222534
2010	0.28677812509473
2011	0.31939170446898
2012	0.318578707901176
2013	0.320858943373435
2014	0.324283293056626