Year	kg per 2010 US$ of GDP
1960	0.279602706034123
1961	0.257003762318229
1962	0.280803148570453
1963	0.313091554840624
1964	0.351213916987246
1965	0.369652434176028
1966	0.420838355906401
1967	0.399317441958797
1968	0.454397936815301
1969	0.472126044078732
1970	0.477290943823562
1971	0.468459409150253
1972	0.473170836657886
1973	0.494616110100553
1974	0.452856014202297
1975	0.439306305266819
1976	0.486969109352323
1977	0.475765665686428
1978	0.477863376108105
1979	0.466889838351056
1980	0.474917901599622
1981	0.414624730684683
1982	0.336408631593053
1983	0.314814931144229
1984	0.309988286104713
1985	0.351910622260437
1986	0.367839593186946
1987	0.38401804588627
1988	0.330365889912222
1989	0.316779478286335
1990	0.30962830949793
1991	0.341522680605929
1992	0.312305467444471
1993	0.334033762277914
1994	0.364862953577696
1995	0.322534675323008
1996	0.361735115572667
1997	0.332954024425697
1998	0.300294097613728
1999	0.279616759985038
2000	0.250392599499158
2001	0.26562215189111
2002	0.282439483316289
2003	0.310353374660037
2004	0.289821594588667
2005	0.229673413824878
2006	0.267394069696868
2007	0.245708365449522
2008	0.215485463884497
2009	0.220903757297504
2010	0.250534124924468
2011	0.223537126802358
2012	0.196108742220334
2013	0.189908285844268
2014	0.191442132651707