Year	kg per kg of oil equivalent energy use
1960	2.7561312006058403
1961	2.7827738802008875
1962	2.848238614306376
1963	2.8110891564386775
1964	2.973744562321695
1965	2.9235606240675396
1966	2.937539502233441
1967	2.8736727145401844
1968	2.961677504094624
1969	2.877011033960279
1970	2.647828481707228
1971	2.6141926379779608
1972	2.85281760091267
1973	2.900559043353483
1974	2.8703858615758127
1975	2.7781755778833546
1976	2.747486226549295
1977	2.8433063523592943
1978	2.5953993005132774
1979	2.595629696494891
1980	2.702410016564689
1981	2.7459956483581296
1982	2.6372067824723033
1983	2.7110433067541693
1984	2.605587150500532
1985	2.4996461735532627
1986	2.5172948939489377
1987	2.5331845798346904
1988	2.5286186455829114
1989	2.613931981784949
1990	2.447350384180975
1991	2.5210086014903714
1992	2.5907499204550595
1993	2.5722677182985416
1994	2.590151935684063
1995	2.5102852860734783
1996	2.437558444639667
1997	2.4181070974078396
1998	2.4429334481219134
1999	2.546911314263555
2000	2.5071294205741723
2001	2.47703426438963
2002	2.541591984885721
2003	2.4102737560416645
2004	2.406125756842345
2005	2.4744934790841615
2006	2.4034176001893153
2007	2.3214776758139335
2008	2.303329068284346
2009	2.3121602833862496
2010	2.167651641785481
2011	2.1828412048460564
2012	2.2490784934924113
2013	2.1636026549300515
2014	2.1704929027292166
2015	2.2576866985750033