Year	kg per kg of oil equivalent energy use
1960	2.8587745267714215
1961	3.003296453996811
1962	2.9642031010965093
1963	2.9065942524539086
1964	2.8941583535212425
1965	2.898215083662499
1966	2.8440007448620586
1967	2.8397046457935073
1968	2.87173416609129
1969	2.9006574389069306
1970	2.9614865995153155
1971	2.562401146023295
1972	2.5567303153851846
1973	2.5445425359753946
1974	2.51578564529774
1975	2.558587836948251
1976	2.5631070180383535
1977	2.5812496557340223
1978	2.5813294397169204
1979	2.583212527278087
1980	2.574314844863884
1981	2.566759650522784
1982	2.599555308821228
1983	2.6103352709446126
1984	2.638648324384115
1985	2.7053999817424628
1986	2.7050404023093475
1987	2.7283188333986153
1988	2.7913146814824867
1989	2.7851668811661114
1990	2.443244889154568
1991	2.550297677436254
1992	2.557106887690222
1993	2.5856725248098815
1994	2.5931714566256825
1995	2.650029475531624
1996	2.593242628668851
1997	2.6030755528470535
1998	2.6293728946163637
1999	2.5731038579240226
2000	2.6055502760327314
2001	2.6493739814524155
2002	2.673499274814755
2003	2.7224320030309315
2004	2.752924608469177
2005	2.827731803432693
2006	2.8578594510517337
2007	2.8988772343618456
2008	2.88965162934261
2009	2.9051180544813153
2010	2.8979910186214513
2011	3.0125934228332145
2012	3.0043702786328366
2013	3.0136722273300687
2014	2.971640661085692
2015	2.5445109689738925