Year	kg per 2010 US$ of GDP
1960	0.192838711938693
1961	0.196785692541007
1962	0.23222316184853
1963	0.223133889675691
1964	0.24580915474629
1965	0.248612296104108
1966	0.257486956694154
1967	0.261255243331901
1968	0.265038406435877
1969	0.272131468263677
1970	0.28963717460115
1971	0.307137794174101
1972	0.322587029616386
1973	0.345045417956148
1974	0.33582913920539
1975	0.336730016654727
1976	0.342068889009961
1977	0.366028548514013
1978	0.341528749150493
1979	0.336202496529753
1980	0.345489784369778
1981	0.347364676493534
1982	0.365286500667946
1983	0.362202407067202
1984	0.359119513689391
1985	0.38377987575238
1986	0.392792622961316
1987	0.398742119090374
1988	0.37890690927479
1989	0.41671564320332
1990	0.399285120655744
1991	0.403934536948508
1992	0.39618325856439
1993	0.382515470027985
1994	0.395476766486924
1995	0.401949621927676
1996	0.409652638016956
1997	0.401697773488262
1998	0.396746851322299
1999	0.40279874800987
2000	0.414919676268649
2001	0.397137985400953
2002	0.39449644428219
2003	0.396862445818701
2004	0.373379356285667
2005	0.360705454044342
2006	0.371127118938427
2007	0.384475674552079
2008	0.380344527775259
2009	0.390498723725371
2010	0.386062623533327
2011	0.374076421664475
2012	0.366679708140757
2013	0.333069258880429
2014	0.337389230996186