Year	kg per 2010 US$ of GDP
1960	1.12547301579083
1961	0.982699331921317
1962	0.918090813386745
1963	0.905683576990736
1964	0.885946913105131
1965	0.903399426353424
1966	0.926002598854716
1967	0.884741782699632
1968	0.906371300485059
1969	0.92958502917101
1970	0.977034074182751
1971	0.995214650825138
1972	0.987464193640687
1973	0.980372903437924
1974	0.956358781058402
1975	0.989434625375586
1976	0.986413986454056
1977	1.00672786249879
1978	1.05043006652936
1979	1.05134997617346
1980	1.02122752055961
1981	0.997581980335107
1982	1.02843038691324
1983	1.05340277016687
1984	1.05912190722789
1985	1.07551804514095
1986	1.07538406001466
1987	1.08152671070867
1988	1.09374319367495
1989	1.08903269086147
1990	1.05619018067152
1991	1.08436899415526
1992	1.11037372038149
1993	1.08632838147331
1994	1.04996046588439
1995	1.05056546820951
1996	1.03107011759076
1997	0.982000512288776
1998	0.950066243753692
1999	0.937396368684233
2000	0.908732266665448
2001	0.89754626984698
2002	0.895305660128871
2003	0.92880467044781
2004	0.930027277456835
2005	0.926759214814895
2006	0.916175957654027
2007	0.887441921485174
2008	0.892540831189527
2009	0.892227031501821
2010	0.884949657540197
2011	0.901935799462325
2012	0.889061837908288
2013	0.851685036336902
2014	0.825382118888542