Year	kg per kg of oil equivalent energy use
1971	1.6313762968536214
1972	1.6785085831179467
1973	1.7123212348235266
1974	1.7674197556809816
1975	1.660217687022803
1976	1.696431939987701
1977	1.6624731725473187
1978	1.6266033285542756
1979	1.788038497484571
1980	1.7750081796571313
1981	1.8085226581658567
1982	1.8253822868260847
1983	1.8164605487650307
1984	1.8781268564134272
1985	1.8862047084079696
1986	1.8535087752040216
1987	1.7518113670575972
1988	1.8091330062855124
1989	1.7170997278076567
1990	1.4040299268335528
1991	1.3673981134997277
1992	1.3951643127055524
1993	1.3774406208317074
1994	1.36269097190923
1995	1.3754763034909705
1996	1.3893009552931286
1997	1.3961610467292818
1998	1.3936398257676124
1999	1.310510042562709
2000	1.3122402773516428
2001	1.4007384809813888
2002	1.4175563435004086
2003	1.4264366773923849
2004	1.455261030772937
2005	1.4602966854922403
2006	1.4466682214275128
2007	1.4394805043076129
2008	1.4381178642273627
2009	1.3602047754535451
2010	1.4155968904853016
2011	1.3813223486916988
2012	1.3887950962836528
2013	1.4170650927236628
2014	1.4490274847946725