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	3.7653307140802648
1966	3.7254525593498817
1967	3.6860539697610375
1968	3.7326235942348536
1969	3.700050162101671
1970	3.655054923729542
1971	3.637196685264843
1972	3.7055258305712844
1973	3.619047297579782
1974	3.573592383434017
1975	3.6445599218761147
1976	3.67790534863874
1977	3.714691569760386
1978	3.5421987562076946
1979	3.5211056032823174
1980	3.669055772896568
1981	3.5197993322083474
1982	3.414939401212917
1983	3.4462847794540616
1984	3.6607847038644397
1985	3.5758091044393425
1986	3.493986579261709
1987	3.49430726681452
1988	3.3716734637382815
1989	3.425237530622323
1990	3.396472399443076
1991	3.4811638474318243
1992	3.4837621144740676
1993	3.4079036380129155
1994	3.5313701458394027
1995	3.417780902612414
1996	3.432471267060465
1997	3.3735716649190426
1998	3.347956842069912
1999	3.334672792975822
2000	3.3310266631725676
2001	3.285418812232026
2002	3.247099416660308
2003	3.280943740929188
2004	3.3170546493380764
2005	3.2706531763013174
2006	3.245953432654403
2007	3.2525405458547083
2008	3.1530714968165863
2009	3.1589178388700256
2010	3.1235916943762554
2011	3.0752343778311437
2012	3.105169199272419
2013	3.056703462991024
2014	3.0391895159938067
2015	3.055690409647199