Year	kg per kg of oil equivalent energy use
1971	1.3484799024620469
1972	1.260094394070564
1973	2.2928992305121283
1974	2.9914077735158338
1975	1.9891726517239134
1976	2.039821599235425
1977	0.8334192122388717
1978	0.5389746827409049
1979	0.582332036160368
1980	0.6567506865405777
1981	0.7404080482708426
1982	1.986548104586162
1983	1.5076793731575764
1984	1.552992586621057
1985	1.6739714774910759
1986	1.4185422645958983
1987	1.7315020581245235
1988	2.015625839954414
1989	1.9509889333190074
1990	1.066952542204959
1991	3.746785428410852
1992	3.7066089699937073
1993	3.6591753515990226
1994	3.944812358898461
1995	3.641511239592797
1996	3.6929034266187117
1997	4.603397969267494
1998	4.447908519053023
1999	4.126543607074714
2000	4.028895350147632
2001	3.757480402037836
2002	3.493188282848446
2003	3.108012964854082
2004	2.8472500144353585
2005	4.435112101599033
2006	3.4894516344379976
2007	4.071603068702944
2008	4.0126922717475315
2009	3.5336676026988383
2010	2.9698116853144603
2011	2.1766947651386657
2012	1.8562583849145202
2013	1.52376134392703
2014	1.5524446627675448