Year	kg per 2011 PPP $ of GDP
1990	0.359002394512479
1991	0.39598271978638
1992	0.362106458591294
1993	0.387299600286017
1994	0.42304488958289
1995	0.373966840893918
1996	0.419418278904837
1997	0.386047684803805
1998	0.348179726447182
1999	0.324205130155003
2000	0.290320813798206
2001	0.307978907739712
2002	0.327477971829619
2003	0.35984308033283
2004	0.336037252560887
2005	0.266297696269075
2006	0.310033379878187
2007	0.284889620368242
2008	0.249847301245186
2009	0.256129608934024
2010	0.290484907212834
2011	0.259182901959496
2012	0.227380720309753
2013	0.220191524045085
2014	0.221969961803502