Year	kg per 2010 US$ of GDP
1988	0.66193257469142
1989	1.20912377362303
1990	0.97472496254078
1991	0.67318370737776
1992	0.706428467950708
1993	0.719267328417972
1994	0.723395315828635
1995	0.726457974891301
1996	0.661423059076203
1997	0.744357350834807
1998	0.763975633613677
1999	0.760738063418584
2000	0.694077271935223
2001	0.708922289776221
2002	0.678308131862411
2003	0.746543441907923
2004	0.648934735186913
2005	0.609379662547705
2006	0.534521756865717
2007	0.45513499880059
2008	0.533153196918042
2009	0.586943342495485
2010	0.521803328365527
2011	0.527272721848427
2012	0.56827780992355
2013	0.55251745939777
2014	0.578053039505943