Year	kg per 2010 US$ of GDP
1990	0.383216772711696
1991	0.412332592039718
1992	0.41234050559938
1993	0.440841231773528
1994	0.440860538946705
1995	0.407399860590952
1996	0.454195299482963
1997	0.485488276044101
1998	0.527461986505655
1999	0.511973629663607
2000	0.564074654363091
2001	0.560854687746832
2002	0.571401067462314
2003	0.570430576295423
2004	0.594527151877379
2005	0.553614801698941
2006	0.593232231755798
2007	0.618110181045062
2008	0.628447350207933
2009	0.662562486125264
2010	0.622395345552591
2011	0.614975537934285
2012	0.594421243327051
2013	0.577893044468893
2014	0.582300728013671