Year	kg per 2010 US$ of GDP
1960	0.815199817413006
1961	0.774144672415809
1962	0.826854895428856
1963	0.667293390710213
1964	0.769246109732344
1965	0.662864649438071
1966	0.717265626778652
1967	0.982415871178668
1968	0.709703481449927
1969	0.75416114183581
1970	1.03130349420564
1971	1.09502562568473
1972	1.02598158666251
1973	0.869288067088658
1974	0.938566787021823
1975	0.884182134748393
1976	0.890134739703503
1977	0.887290787776505
1978	0.830045734296333
1979	0.780589702428579
1980	0.783488106874986
1981	0.751821079545104
1982	0.706833850187612
1983	0.69838582704097
1984	0.757254566110124
1985	0.751876421073141
1986	0.769046880211844
1987	0.587010575306211
1988	0.547998090437449
1989	0.572704776836035
1990	0.533671648915756
1991	0.525188560569414
1992	0.560000715619527
1993	0.577232374392644
1994	0.627749490529817
1995	0.654176671558481
1996	0.640809134838165
1997	0.626758458552761
1998	0.637769887433187
1999	0.63826013867172
2000	0.631096820098352
2001	0.490154547037099
2002	0.461815349352964
2003	0.433766298069921
2004	0.482387554502393
2005	0.396193992547214
2006	0.388152122326735
2007	0.347283289606634
2008	0.239801844585808
2009	0.226411760313644
2010	0.252629501931641
2011	0.273320449230467
2012	0.197174191593373
2013	0.211246382885683
2014	0.32903696325069