Year	kg per kg of oil equivalent energy use
1971	1.631376296853621
1972	1.6785085831179472
1973	1.7123212348235262
1974	1.7674197556809816
1975	1.660217687022803
1976	1.696431939987701
1977	1.6624731725473185
1978	1.6266033285542758
1979	1.7880384974845709
1980	1.7750081796571318
1981	1.8085226581658569
1982	1.8253822868260854
1983	1.8164605487650305
1984	1.8781268564134268
1985	1.886204708407969
1986	1.8535087752040214
1987	1.751811367057597
1988	1.8091330062855122
1989	1.7170997278076565
1990	1.404029926833553
1991	1.367398113499728
1992	1.3951643127055524
1993	1.3774406208317076
1994	1.3626909719092295
1995	1.3754763034909707
1996	1.3893009552931281
1997	1.3961610467292824
1998	1.3936398257676126
1999	1.3105100425627088
2000	1.3122402773516426
2001	1.400738480981389
2002	1.4175563435004086
2003	1.4264366773923849
2004	1.4552610307729368
2005	1.4602966854922403
2006	1.4466682214275128
2007	1.4394805043076127
2008	1.4381178642273624
2009	1.3602047754535451
2010	1.4155968904853016
2011	1.3813223486916992
2012	1.3887950962836528
2013	1.4170650927236628
2014	1.4490274847946722