Year	kg per kg of oil equivalent energy use
1960	2.961490368497409
1961	2.945146340916923
1962	2.9216043038996427
1963	2.901089411914142
1964	2.9056895256715602
1965	2.90043245657125
1966	2.878725822121542
1967	2.8427751926312634
1968	2.82202654952854
1969	2.8131733362206157
1970	2.855011146819567
1971	2.674848762552813
1972	2.6706735470149585
1973	2.6741045741651326
1974	2.642018677864157
1975	2.614138412929912
1976	2.609313972647768
1977	2.597737900911535
1978	2.5938840440478557
1979	2.6017276715385025
1980	2.5852257069371736
1981	2.5379848919308103
1982	2.5201314434281787
1983	2.5162718216756543
1984	2.4997928354385515
1985	2.5068929426977444
1986	2.500321026425454
1987	2.4972716879573365
1988	2.513736504993898
1989	2.5201374230560707
1990	2.3996338095119856
1991	2.406739407494302
1992	2.402437227615573
1993	2.3932683081329498
1994	2.3914277409690996
1995	2.3982439250850205
1996	2.3898187673647384
1997	2.4061603244735856
1998	2.4106630329606027
1999	2.3732934049828462
2000	2.391463476178929
2001	2.403941249501141
2002	2.3910981639429534
2003	2.412033949601277
2004	2.417274570796421
2005	2.441198285250298
2006	2.4505437771466774
2007	2.478249101263738
2008	2.465742328757996
2009	2.4541121306755236
2010	2.467056501544564
2011	2.506056685701883
2012	2.492766598157852
2013	2.5074840655946806
2014	2.4841062301306747
2015	2.2636119035474325