Year	kg per 2011 PPP $ of GDP
1990	0.392186842640467
1991	0.390043455070969
1992	0.384356737670569
1993	0.382740058293062
1994	0.375813210071043
1995	0.370658852431418
1996	0.369676678729261
1997	0.360430579773412
1998	0.34993782888084
1999	0.342609482997854
2000	0.33762303669841
2001	0.33185085097442
2002	0.328083310433707
2003	0.326397407346345
2004	0.319423383341738
2005	0.310910637120509
2006	0.300852748593723
2007	0.295518596748807
2008	0.289313308833857
2009	0.28141750608949
2010	0.281734357430826
2011	0.272287162868318
2012	0.264613336563883
2013	0.260257877999029
2014	0.252211600921938