Year	kg per 2011 PPP $ of GDP
1990	0.493717355691503
1991	0.509103823128316
1992	0.522901735896449
1993	0.512739930867304
1994	0.497282619625894
1995	0.496781004943453
1996	0.486061133637359
1997	0.463726004223516
1998	0.449459972661881
1999	0.441118305004657
2000	0.428630084785822
2001	0.42198428866816
2002	0.420014206356843
2003	0.434333530365394
2004	0.435080198791999
2005	0.433167790844055
2006	0.427522691803127
2007	0.413651877327742
2008	0.416822263160049
2009	0.414887421509439
2010	0.410964596569945
2011	0.419223126021514
2012	0.413090614021937
2013	0.394588392136629
2014	0.381506043006107