Year	kg per kg of oil equivalent energy use
1960	3.320836642629511
1961	3.319590925619843
1962	3.277486200991514
1963	3.2786215136524373
1964	3.2522899084184234
1965	3.2250295712576613
1966	3.212320555327585
1967	3.12197688732471
1968	3.09842854903336
1969	3.0467377846885317
1970	2.996289474593804
1971	3.012756334432642
1972	2.994773874198397
1973	2.9592829807200505
1974	2.932906398247228
1975	2.9240268307308397
1976	2.9322150118637476
1977	2.904970465195817
1978	2.8794512827908716
1979	2.8889651420342557
1980	2.8684725294841655
1981	2.8015879995475004
1982	2.775732595790179
1983	2.7152502587592817
1984	2.6550917468334907
1985	2.6229414096562684
1986	2.570060169331095
1987	2.5519905326334373
1988	2.499353291493939
1989	2.546722278027266
1990	2.522059751413098
1991	2.501621083581457
1992	2.508604119724851
1993	2.4539874968814246
1994	2.4509699969762284
1995	2.414977965835651
1996	2.39337524119384
1997	2.3566516335729233
1998	2.356051578410009
1999	2.337691187785739
2000	2.339138522041175
2001	2.3220543788797556
2002	2.319353138291064
2003	2.321351719270629
2004	2.3045394850916434
2005	2.290199903014334
2006	2.299196272995729
2007	2.3069740682332918
2008	2.2847901155329575
2009	2.2479532550462284
2010	2.22655641646654
2011	2.2453659618403217
2012	2.2266181172105104
2013	2.2067176964867055
2014	2.177828090535928
2015	2.0935519998050993