Year	kg per 2010 US$ of GDP
1960	0.442918413090569
1961	0.44387101161304
1962	0.459106245187707
1963	0.46009766762157
1964	0.463927768952001
1965	0.485886472149929
1966	0.472090670833437
1967	0.477067725869944
1968	0.472749921056201
1969	0.466684703763849
1970	0.451864831259327
1971	0.449644146601706
1972	0.446060032592817
1973	0.471977448660778
1974	0.456990162309601
1975	0.460132259977372
1976	0.444345708461293
1977	0.462250956455488
1978	0.492853299344043
1979	0.480862640216567
1980	0.502378951811663
1981	0.507326846294655
1982	0.498994922958938
1983	0.490456489214785
1984	0.493130993643823
1985	0.477715082846001
1986	0.456771107146961
1987	0.47534974538369
1988	0.458398896153533
1989	0.469418346698926
1990	0.430289761377823
1991	0.428342257245381
1992	0.437204246554948
1993	0.435032150942236
1994	0.419466901166694
1995	0.409410090886457
1996	0.42251449284411
1997	0.411277528134374
1998	0.407540003832054
1999	0.398215866213948
2000	0.38797441670089
2001	0.375312418937941
2002	0.379212135658297
2003	0.362734876391255
2004	0.355261377217989
2005	0.351738270575514
2006	0.357003582369296
2007	0.350133028021212
2008	0.350317061271838
2009	0.351576464238057
2010	0.341024993689648
2011	0.33364333070492
2012	0.318090539635305
2013	0.297315641705689
2014	0.281300822653027