Year	kg per 2010 US$ of GDP
1960	0.189974627886933
1961	0.181188462231544
1962	0.181435641733491
1963	0.188544872643562
1964	0.194625188514551
1965	0.352121914471959
1966	0.347461459329475
1967	0.143250857841242
1968	-0.0155235475860232
1969	0.101184279400482
1970	0.2483124204345
1971	0.257020039618689
1972	0.259930977896431
1973	0.293331571304236
1974	0.336077059065849
1975	0.435680009764047
1976	0.274998734422019
1977	0.357312015469636
1978	0.4358487057658
1979	0.449368338035759
1980	0.537023796685628
1981	0.502724780489325
1982	0.431939958188889
1983	0.393254679981557
1984	0.476195863157221
1985	0.373139407405026
1986	0.359890203283735
1987	0.312584302576424
1988	0.351579214527059
1989	0.45566037924995
1990	0.395043278567154
1991	0.414487553218302
1992	0.415975102493593
1993	0.42404740472888
1994	0.460474119123316
1995	0.391441098460256
1996	0.410697347277092
1997	0.347497626223739
1998	0.344733056688403
1999	0.349813664130539
2000	0.36080657740366
2001	0.379374048372718
2002	0.392543984890018
2003	0.405944736188119
2004	0.403213402245369
2005	0.424017099014336
2006	0.336808316712688
2007	0.35156081944713
2008	0.332117573767358
2009	0.292755909147468
2010	0.477623861973344
2011	0.508650858011286
2012	0.457594709911035
2013	0.473700732823851
2014	0.46714287345723