Year	kg per 2010 US$ of GDP
1988	0.771213387644317
1989	0.745730696384151
1990	0.750725031970415
1991	0.793515027443254
1992	0.822089992010171
1993	0.827335132787638
1994	0.794940190370463
1995	0.760753167368894
1996	0.753954580393985
1997	0.731856656082189
1998	0.775479447698078
1999	0.804620223661335
2000	0.803614388518725
2001	0.784775822333306
2002	0.699849141657488
2003	0.760651789486182
2004	0.724463650498773
2005	0.701104743666756
2006	0.695389466283351
2007	0.666585102161415
2008	0.672803030450427
2009	0.641272814217658
2010	0.600662398919215
2011	0.532607438529163
2012	0.492069145235675
2013	0.450025742015658
2014	0.443809289627534