Year	kg per kg of oil equivalent energy use
1960	3.945864120195692
1961	3.930220395500477
1962	3.7868178199415614
1963	3.741629999156044
1964	3.6581552847445256
1965	3.5755890718144574
1966	3.6187948523834113
1967	3.52419934166812
1968	3.4333349598734486
1969	3.3054689097257204
1970	3.1462032150973966
1971	3.0642834363249674
1972	3.0113785249856124
1973	3.0197285163785414
1974	2.996636655451603
1975	2.885245377514557
1976	2.8647797390929215
1977	2.8053971538855667
1978	2.8606385821358296
1979	2.8611355365030016
1980	2.89312148474681
1981	2.8490449356470378
1982	2.8341145773562495
1983	2.4810973945218304
1984	2.4676371766203498
1985	2.3686390348348736
1986	2.25112683786977
1987	2.2097854867793414
1988	2.124345728505526
1989	2.2533195812639124
1990	2.2800576616174166
1991	2.275445333164652
1992	2.218455300614123
1993	2.227287317980552
1994	2.1901815248752867
1995	2.145610809159146
1996	2.124237992973707
1997	2.0741276211934516
1998	2.0887161591817565
1999	2.0124404395332993
2000	2.017963175888616
2001	2.0418673565419954
2002	1.9900846567830164
2003	1.9912813599013828
2004	1.9562393277124994
2005	1.9000202180977914
2006	1.8829334276192247
2007	1.8443290364822356
2008	1.8303870543688803
2009	1.7764949101290886
2010	1.7640393641730778
2011	1.7002212938440318
2012	1.7644487326841405
2013	1.73233288972151
2014	1.7083937157790698
2015	1.8012893977657578