Year	kg per kg of oil equivalent energy use
1971	1.2378674148499376
1972	1.2909076441951808
1973	1.356111916864976
1974	1.3773888239717298
1975	1.309793152527687
1976	1.408002555554853
1977	1.6313712101225486
1978	1.5660249085957196
1979	1.2082568393068054
1980	1.3212830157699027
1981	1.3586487664467943
1982	1.3124169992897838
1983	1.191371493821438
1984	1.0021918134414989
1985	1.0309756461263486
1986	1.171493915067767
1987	1.2500768945273653
1988	1.218630393345289
1989	0.7472555644662977
1990	0.9558723746940466
1991	0.896106278204595
1992	1.014375144910735
1993	1.0124438553862012
1994	1.15205169934456
1995	1.1730402591843518
1996	1.2257496089119821
1997	1.2542080340745898
1998	1.4537795169900156
1999	1.441378642025878
2000	1.4980326896958398
2001	1.5481028649357065
2002	1.543097262256601
2003	1.682283806105836
2004	1.5981509748365803
2005	1.5027388288841779
2006	1.5909815686019964
2007	1.620495837026005
2008	1.5305343314979505
2009	1.4977153869956683
2010	1.5256335184728511
2011	1.5596257682873478
2012	1.426875953976101
2013	1.2758704761298556
2014	1.2996349281801534