Year	kg per 2010 US$ of GDP
1990	1.25576708483946
1991	1.26797893382172
1992	1.23506816284893
1993	1.20603000136783
1994	1.08614310912254
1995	1.05533444159406
1996	1.02662334685583
1997	0.970252630809584
1998	0.889280405767403
1999	0.824644679431894
2000	0.777245362611255
2001	0.774900131550742
2002	0.736493036102786
2003	0.730760443356081
2004	0.681457618554392
2005	0.652459361806149
2006	0.63379623983635
2007	0.595486493089604
2008	0.561516150608116
2009	0.528423414072272
2010	0.543312924746422
2011	0.527976679904406
2012	0.495460624685081
2013	0.475911961803622
2014	0.446630397941994