Year	kg per kg of oil equivalent energy use
1960	2.9614903684974085
1961	2.945146340916923
1962	2.9216043038996418
1963	2.901089411914141
1964	2.905689525671561
1965	2.9004324565712496
1966	2.878725822121542
1967	2.8427751926312643
1968	2.822026549528541
1969	2.813173336220616
1970	2.855011146819567
1971	2.8376762663492054
1972	2.8264628137526593
1973	2.811162887946917
1974	2.78038893120899
1975	2.749318817582988
1976	2.7206641189716385
1977	2.706438978926806
1978	2.6940557803917287
1979	2.7063648525340174
1980	2.707394374557452
1981	2.671438948986361
1982	2.644618599421019
1983	2.6249078454168506
1984	2.587402125732905
1985	2.5601189475609765
1986	2.531899942603988
1987	2.5234899420918935
1988	2.521953117906744
1989	2.5417650390924975
1990	2.4773074472675853
1991	2.458730271773826
1992	2.443851620825961
1993	2.429492628324226
1994	2.429700749578101
1995	2.410148859221501
1996	2.4149704033410098
1997	2.443582400639362
1998	2.4355215299817656
1999	2.404496631170485
2000	2.412622766985261
2001	2.422206429598798
2002	2.3868999379807683
2003	2.3973481534163374
2004	2.3761579452439743
2005	2.3687655294908945
2006	2.3537748735868895
2007	2.3729777564408794
2008	2.3446197384683827
2009	2.305519376899625
2010	2.319147227811219
2011	2.3181560262920797
2012	2.298400607219765
2013	2.299001973361695
2014	2.271885130286323
2015	2.2636119035474325