Year	kg per 2010 US$ of GDP
1960	0.1991675335993
1961	0.195498138411944
1962	0.207409283148012
1963	0.239049138392295
1964	0.240997119255214
1965	0.180958009686587
1966	0.215473764720914
1967	0.226806294029702
1968	0.254905249056362
1969	0.25065013444476
1970	0.269848152706153
1971	0.280312315526539
1972	0.292237214469467
1973	0.312860608864468
1974	0.292095372467448
1975	0.289244321695421
1976	0.317258319848175
1977	0.373303709504679
1978	0.375748858517083
1979	0.332412581883741
1980	0.376274953373006
1981	0.377140960235643
1982	0.375687403927217
1983	0.339826254376669
1984	0.319308842016092
1985	0.35794690299482
1986	0.410908086172307
1987	0.446025518100646
1988	0.469614504843683
1989	0.314196563532853
1990	0.542137254926008
1991	0.427498497052072
1992	0.508376887678201
1993	0.490842457091082
1994	0.524151474138231
1995	0.541312419064725
1996	0.52647864551673
1997	0.553543130636646
1998	0.581064859704298
1999	0.575452536030552
2000	0.573460110566096
2001	0.586826145529022
2002	0.593210796581071
2003	0.632230805217327
2004	0.602335876860033
2005	0.563722983162878
2006	0.559628517091967
2007	0.549208438052402
2008	0.509828771374699
2009	0.535930024392892
2010	0.517898686549372
2011	0.524145349194789
2012	0.46591894883213
2013	0.43734479735802
2014	0.445958742339676