Year	kg per kg of oil equivalent energy use
1971	1.6313762968536214
1972	1.678508583117947
1973	1.7123212348235266
1974	1.7674197556809819
1975	1.660217687022803
1976	1.696431939987701
1977	1.6624731725473194
1978	1.6266033285542756
1979	1.788038497484571
1980	1.7750081796571318
1981	1.8085226581658567
1982	1.8253822868260847
1983	1.8164605487650305
1984	1.8781268564134272
1985	1.8862047084079692
1986	1.8535087752040211
1987	1.7518113670575974
1988	1.8091330062855122
1989	1.717099727807657
1990	1.4036742338178805
1991	1.3673981134997277
1992	1.3951643127055524
1993	1.3774406208317074
1994	1.3626909719092295
1995	1.3754763034909712
1996	1.3893009552931281
1997	1.3961610467292818
1998	1.3936398257676124
1999	1.310510042562709
2000	1.3122402773516426
2001	1.4007384809813888
2002	1.4175563435004088
2003	1.426436677392385
2004	1.4543251999130002
2005	1.4594066173066462
2006	1.4457419879835034
2007	1.4386681184081063
2008	1.4381178642273627
2009	1.3602047754535453
2010	1.4155968904853016
2011	1.3813223486916988
2012	1.3887950962836528
2013	1.4170650927236625
2014	1.4490274847946722