Year	kg per 2010 US$ of GDP
1960	0.173455339147639
1961	0.154022917501339
1962	0.139608586086477
1963	0.156901647712903
1964	0.174402903910943
1965	0.179264335447829
1966	0.191171558574987
1967	0.195740000616515
1968	0.230921669663297
1969	0.254362319466011
1970	0.283665091631155
1971	0.263216114902176
1972	0.272614410569658
1973	0.273988736714291
1974	0.285175637320543
1975	0.310665109587728
1976	0.31865518266603
1977	0.289377301929682
1978	0.381325009449576
1979	0.429015995085274
1980	0.457061293389177
1981	0.537362575234848
1982	0.617147314260056
1983	0.627827240400838
1984	0.664993721922283
1985	0.584852483049745
1986	0.444405203066574
1987	0.440853779583617
1988	0.475719138080598
1989	0.552678999686538
1990	0.44259543219226
1991	0.416060613747089
1992	0.550264844600309
1993	0.586242918852803
1994	0.317139604733743
1995	0.518921462101417
1996	0.540223262732881
1997	0.393010424362631
1998	0.465557138446651
1999	0.467734423812844
2000	0.445949871216136
2001	0.478360445899987
2002	0.495982063679887
2003	0.521864984860447
2004	0.519449105898738
2005	0.514022773161405
2006	0.469494035289975
2007	0.507652112914496
2008	0.506948659791637
2009	0.536840504324292
2010	0.524200828384674
2011	0.514605229601273
2012	0.481200098280457
2013	0.492860948645502
2014	0.508721247650634