Year	kg per kg of oil equivalent energy use
1960	2.9703165709658164
1961	2.953613623109134
1962	2.928770448821857
1963	2.908068158322597
1964	2.9115355179893694
1965	2.9063830049708406
1966	2.8841389911207354
1967	2.8474978195512572
1968	2.8261441446877815
1969	2.817000431835343
1970	2.8582980333385044
1971	2.8743998405428512
1972	2.870807592358046
1973	2.8609693605975828
1974	2.830294087095423
1975	2.7970127174023847
1976	2.772924087755781
1977	2.7578970416511286
1978	2.740358414268762
1979	2.7487389682000636
1980	2.7529218045736976
1981	2.7065427491215264
1982	2.665415534087346
1983	2.646045735106574
1984	2.6122932812570543
1985	2.5880296555287234
1986	2.565067710901692
1987	2.5426417145241316
1988	2.5398383719626922
1989	2.549025938655274
1990	2.496353830046738
1991	2.4769963081451603
1992	2.4509256368554326
1993	2.433453179881092
1994	2.429620225468127
1995	2.413179274626139
1996	2.413586781641956
1997	2.4362844027029023
1998	2.4265390716920554
1999	2.400695169502146
2000	2.4034110728565503
2001	2.414090058992032
2002	2.3768398791454177
2003	2.38767679260194
2004	2.3641019312067875
2005	2.364083922255405
2006	2.344464505798646
2007	2.3591099108519287
2008	2.326579819026993
2009	2.288945775364842
2010	2.298009006672013
2011	2.3023496936395578
2012	2.2804586746031985
2013	2.2904829920582275
2014	2.25903833678922
2015	2.242083932663357