Year	kg per 2010 US$ of GDP
1960	0.36000140257199
1961	0.345483166525751
1962	0.349703576026827
1963	0.341141379614979
1964	0.34383343134611
1965	0.33850189366323
1966	0.342184102238082
1967	0.351893879630198
1968	0.347920509606801
1969	0.354318564496089
1970	0.366705546180547
1971	0.362603368602962
1972	0.355114583758981
1973	0.356937434029496
1974	0.355039316060976
1975	0.34864060400481
1976	0.343957949753619
1977	0.343113099587745
1978	0.355691393859629
1979	0.357159926512462
1980	0.353872522927014
1981	0.34899345835471
1982	0.359744963949339
1983	0.354101601353655
1984	0.343408438201733
1985	0.34090070350848
1986	0.338682578445485
1987	0.344074434404215
1988	0.348697043230357
1989	0.364218306558634
1990	0.349444465477553
1991	0.343966251809446
1992	0.342080067973492
1993	0.341676567035395
1994	0.338661624357663
1995	0.33691204219551
1996	0.341225661737352
1997	0.342476741382503
1998	0.355886135526427
1999	0.361883360463706
2000	0.346632304312361
2001	0.351669682056914
2002	0.354865149033616
2003	0.357977655382744
2004	0.338875876545369
2005	0.342342460086265
2006	0.334978831052776
2007	0.323112622774309
2008	0.326659756748004
2009	0.3258134128143
2010	0.324069349495327
2011	0.316898641071466
2012	0.321993179154173
2013	0.317977739647497
2014	0.321162679240408