Year	kg per 2011 PPP $ of GDP
1990	0.733669288339863
1991	0.741371834564298
1992	0.724882874833482
1993	0.707896086555561
1994	0.637694904813881
1995	0.619632154450612
1996	0.603165394734114
1997	0.571628906814684
1998	0.524072137178939
1999	0.486800861942707
2000	0.458966776117359
2001	0.457318411758132
2002	0.434190324394702
2003	0.430979061953592
2004	0.401150477956806
2005	0.38422053081289
2006	0.373103542040279
2007	0.350462032496264
2008	0.329641423821826
2009	0.309912250801158
2010	0.319247598643512
2011	0.310131308445095
2012	0.290701998250552
2013	0.278855693603311
2014	0.261624333278361