Year	kg per 2011 PPP $ of GDP
2000	0.541333505149948
2001	0.621035715199274
2002	0.572543128635659
2003	0.560322167838507
2004	0.486099430310187
2005	0.536588954417056
2006	0.529775710114143
2007	0.447616298979158
2008	0.389834019702825
2009	0.37171254186115
2010	0.325569320023714
2011	0.318559505876191
2012	0.356082910655137
2013	0.308064527741498
2014	0.375833315971006