Year	kg per 2010 US$ of GDP
1960	0.521924734137753
1961	0.520634317466969
1962	0.52832791787793
1963	0.525563046289302
1964	0.517694430469099
1965	0.526618242061261
1966	0.531915191045521
1967	0.548213659024536
1968	0.566812255222586
1969	0.560570690784022
1970	0.554823550509286
1971	0.558709191789025
1972	0.545939212648982
1973	0.558552657892252
1974	0.545063333241206
1975	0.544950289005116
1976	0.551086381308825
1977	0.569172535198589
1978	0.591619123018349
1979	0.604545691090863
1980	0.622322723647321
1981	0.623086965467838
1982	0.65051053371297
1983	0.666888653542644
1984	0.676611636926767
1985	0.705896463646331
1986	0.71968448536464
1987	0.727356007734894
1988	0.736016598645111
1989	0.756625702085485
1990	0.720621895364635
1991	0.741250702267243
1992	0.733883293773439
1993	0.745683904206911
1994	0.749881564987816
1995	0.740687003044539
1996	0.738688399192626
1997	0.724504881928561
1998	0.729536295938426
1999	0.754380543450497
2000	0.749677899214283
2001	0.751611308727514
2002	0.75375154703493
2003	0.756885132069193
2004	0.745434093597346
2005	0.727063413439077
2006	0.722699474869962
2007	0.709892727758325
2008	0.733523506182741
2009	0.757606701711651
2010	0.7215828918327
2011	0.724644542087363
2012	0.735806381659535
2013	0.689229686589571
2014	0.697799310234673