Year	kg per 2010 US$ of GDP
2005	0.59805661824019
2006	0.638259490197931
2007	0.564468842362324
2008	0.643051511451923
2009	0.453252613439525
2010	0.623688866560643
2011	0.601608470509033
2012	0.56199004141821
2013	0.522280359650447
2014	0.504757028044701