Year	kg per kg of oil equivalent energy use
1971	0.9564935775329131
1972	0.8297515501100733
1973	0.8943366142416685
1974	0.9810146524107454
1975	0.8700497619567676
1976	0.914996854569905
1977	0.8749709365204117
1978	0.8613087615861201
1979	1.0118367093501073
1980	1.0122357661329922
1981	1.0094426647969073
1982	0.979161708222951
1983	0.9618547172926754
1984	1.0167208939839716
1985	1.0065439792282422
1986	1.0062471012225542
1987	0.9628701330507097
1988	1.0270841447134766
1989	0.903608537230509
1990	1.2167712695525637
1991	1.2068665639965415
1992	1.203063604678434
1993	1.186036014557546
1994	1.1486046218992998
1995	1.1348728592143902
1996	1.1396830406421181
1997	1.128111514587327
1998	1.1356626666089715
1999	1.1326227592105116
2000	1.1369992719637356
2001	1.1509923344126074
2002	1.1435376525915655
2003	1.1225019201915059
2004	1.1526890626852073
2005	1.1758731413197818
2006	1.1929063688167703
2007	1.2034378158998758
2008	1.1888516725634424
2009	1.1547411505725207
2010	1.178146346955703
2011	1.1724157538102535
2012	1.1267970957536386
2013	1.1381284317626439
2014	1.0216639234851437