Year	kg per 2010 US$ of GDP
1960	0.350333435382506
1961	0.338294837333823
1962	0.341016188545747
1963	0.334487216264784
1964	0.336638990795533
1965	0.331702666466407
1966	0.335987622528822
1967	0.345690865475134
1968	0.342339628880176
1969	0.348946521927382
1970	0.361002302499685
1971	0.354186357709448
1972	0.34688393052424
1973	0.348005629940598
1974	0.34646292563933
1975	0.337547182750621
1976	0.334702343984919
1977	0.332211369240526
1978	0.34706881559725
1979	0.34906053117031
1980	0.345688764175302
1981	0.343134929200045
1982	0.354043065326021
1983	0.35005684028391
1984	0.33934559613889
1985	0.33721976998096
1986	0.334920427674265
1987	0.340507115670091
1988	0.345228137678619
1989	0.36147497400202
1990	0.346286566244323
1991	0.341430296588561
1992	0.338798228420868
1993	0.338691017746998
1994	0.33514304715229
1995	0.335764405322831
1996	0.340145908587215
1997	0.342480465958734
1998	0.356473924982844
1999	0.363093865824286
2000	0.34743189337805
2001	0.353395026969009
2002	0.356627704959338
2003	0.359999750738452
2004	0.341004541065096
2005	0.344290570839481
2006	0.336487202749284
2007	0.324312828167509
2008	0.327036700544883
2009	0.326199792382826
2010	0.322631646504288
2011	0.315656787435728
2012	0.321052442053191
2013	0.317283287294171
2014	0.320461386860672