Year	kg per kg of oil equivalent energy use
1960	2.7408163009050206
1961	2.7670237525709176
1962	2.8583497472367516
1963	2.8713348207044906
1964	2.787073402880604
1965	2.7661262416974015
1966	2.8506137574327655
1967	2.856221588880764
1968	2.759383375251121
1969	2.752148128890516
1970	2.721026928367454
1971	2.9563255782118234
1972	2.949826753285481
1973	2.9745692361267535
1974	2.947968083205974
1975	2.931668840212672
1976	2.9117269012461717
1977	2.887853709483364
1978	2.95719519964934
1979	2.9401189429218153
1980	2.9729140010740776
1981	2.9526147853708844
1982	2.963002716570745
1983	2.8988116248177627
1984	2.8833461063860923
1985	2.8779704382728
1986	2.801108801039938
1987	2.8158223032961387
1988	2.7947951603091172
1989	2.8117893226534796
1990	2.7652196801433835
1991	2.690849035557672
1992	2.6957232488368477
1993	2.6739345302560307
1994	2.6764909876130303
1995	2.616877759294051
1996	2.592299054713731
1997	2.5768644136822916
1998	2.572114304260183
1999	2.5725514340668694
2000	2.543715808397344
2001	2.5367644909729896
2002	2.5589221291670055
2003	2.545174549221476
2004	2.5834715863324362
2005	2.5426475559824633
2006	2.527163815849155
2007	2.495817426280058
2008	2.4499063306409834
2009	2.3411692987928494
2010	2.332922655592333
2011	2.361965281819511
2012	2.335553188558585
2013	2.229812401946904
2014	2.2312473197813523
2015	2.2416638647527076