Year	kg per 2010 US$ of GDP
2000	1.41436045743615
2001	1.34576091071878
2002	1.27570600808074
2003	1.33775170337251
2004	1.27592620843264
2005	1.25645389749153
2006	1.30280267748959
2007	1.27291043478657
2008	1.30705115947182
2009	1.34916957011694
2010	1.38367521040342
2011	1.3129517570031
2012	1.26736200221455
2013	1.31336206648697
2014	1.27141614503776