Year	kg per kg of oil equivalent energy use
1971	1.8884764679401695
1972	1.982037325575577
1973	2.2375263046668277
1974	2.137650618371923
1975	2.343549358855415
1976	2.3209511562974448
1977	1.7866202574342178
1978	2.4162434395254326
1979	2.6710489313372756
1980	2.6906553958428527
1981	3.2118346296685045
1982	3.4474196836442905
1983	3.769969728217107
1984	3.827094968043928
1985	3.460372221688968
1986	2.732005534571309
1987	2.639799649141497
1988	2.880230971191637
1989	3.5350357776682815
1990	2.4644440751288936
1991	2.4288939784772334
1992	2.5548415063024867
1993	2.569908599465096
1994	2.533809167717337
1995	2.513129130368383
1996	2.7129486784658825
1997	2.736425412712212
1998	2.643928728818744
1999	2.6041499744046748
2000	2.4240779797641103
2001	2.5034722047776126
2002	2.583941118126856
2003	2.5860096446503276
2004	2.8408748016863754
2005	2.907623982853693
2006	3.103719569607602
2007	2.7877393752071016
2008	3.0976874351536785
2009	2.7852535980701276
2010	2.944051550215196
2011	2.848394332032272
2012	2.977051589223772
2013	2.9743300157572357
2014	2.905372852421727