Year	kg per kg of oil equivalent energy use
1960	3.687415517445506
1961	3.6550119510613057
1962	3.6186709800635577
1963	3.7946359945252763
1964	3.8435681816909857
1965	3.8498304538650325
1966	3.8081532340202258
1967	3.724020876892954
1968	3.7713738361418425
1969	3.7120657674829434
1970	3.70079278437889
1971	3.4432229215709738
1972	3.47581231180397
1973	3.4137929885624123
1974	3.411482421233376
1975	3.414267286789093
1976	3.40872772810499
1977	3.374856182845527
1978	3.2893472020339494
1979	3.2703704907801954
1980	3.3210130121292627
1981	3.2604780481050084
1982	3.2305967929104016
1983	3.2658099925704556
1984	3.3063230603655964
1985	3.263080132829722
1986	3.2319607491617273
1987	3.2335436758433245
1988	3.1235719820508527
1989	3.1592559900596404
1990	2.8897803091225516
1991	2.9153163385397267
1992	2.9356792723344505
1993	2.8759963545454257
1994	2.9192925849935665
1995	2.822537440371088
1996	2.8164355923272013
1997	2.792908689562664
1998	2.7579524902293193
1999	2.7479150234960286
2000	2.749617539157799
2001	2.721464931527334
2002	2.6567184364552126
2003	2.68935432135023
2004	2.684374141707216
2005	2.646476783347488
2006	2.638497499872718
2007	2.66703585904876
2008	2.6058629996189135
2009	2.580383216696143
2010	2.575406143369642
2011	2.5794244112266087
2012	2.557392450742309
2013	2.5189755511962004
2014	2.486117109921555
2015	2.6266151937518134