Year	kg per 2010 US$ of GDP
1961	0.588597605897392
1962	0.584603283120984
1963	0.565426763793429
1964	0.597243582024879
1965	0.595664171004878
1966	0.574097630199288
1967	0.605368452615418
1968	0.620830960079182
1969	0.598530028116001
1970	0.646380323181089
1971	0.641945736941421
1972	0.657650674683891
1973	0.616353550952431
1974	0.609834644453462
1975	0.612106875777405
1976	0.581286727418937
1977	0.574397431129138
1978	0.56450313350396
1979	0.5785548328052
1980	0.567840946257324
1981	0.532377104203869
1982	0.530481281190095
1983	0.509398107527979
1984	0.500875387492548
1985	0.474267751023225
1986	0.445584883403814
1987	0.455944739563365
1988	0.461695818970044
1989	0.458383263620962
1990	0.429883997575426
1991	0.43056588863137
1992	0.440919841657292
1993	0.433974130373739
1994	0.425810461681329
1995	0.424439814780475
1996	0.42820142516886
1997	0.424224905492076
1998	0.417573501915893
1999	0.404022625714059
2000	0.398284112345772
2001	0.386558071940144
2002	0.369130741852532
2003	0.386175974094489
2004	0.373999807917849
2005	0.365817214776997
2006	0.347732486451054
2007	0.347270751576999
2008	0.347945652123536
2009	0.342939625687803
2010	0.331364372750648
2011	0.322722263422707
2012	0.305528298177139
2013	0.298399687008173
2014	0.30131545131409