Year	kg per 2010 US$ of GDP
1966	0.52165942458304
1967	0.563097572217184
1968	0.534528514701017
1969	0.556981915688803
1970	0.581064805562811
1971	0.65331739552593
1972	0.605134493843952
1973	0.844838972008106
1974	0.808082776667533
1975	0.872687775496206
1976	0.831842264963514
1977	0.87337704880985
1978	1.07004222825093
1979	1.01236327737204
1980	1.06310915667498
1981	0.908602176134132
1982	0.746661268649311
1983	0.759890020918728
1984	0.615592171916402
1985	0.622056499477715
1986	0.550659594516937
1987	0.603970749974625
1988	0.488687009825397
1989	0.677506217109922
1990	0.727792718618489
1991	0.714822019924773
1992	0.697465044089628
1993	0.661371134625479
1994	0.66788581557218
1995	0.730798887457482
1996	0.773430113303031
1997	0.816946349319975
1998	0.802264519411564
1999	0.815218324331741
2000	0.834846719006286
2001	0.848383946445683
2002	0.802465135118583
2003	0.806234329006627
2004	0.795974960379717
2005	0.776181513068393
2006	0.825976722871792
2007	0.683661866292175
2008	0.729061921779173
2009	0.577880226116212
2010	0.552816041294921
2011	0.585219476061624
2012	0.559164788635096
2013	0.603385927567231
2014	0.549572674296178