Year	kg per kg of oil equivalent energy use
1971	2.0915714187781873
1972	2.1164852474301887
1973	2.1321315297680132
1974	2.1106804097801835
1975	2.2087693766389904
1976	2.23740488717758
1977	2.2727028720920583
1978	2.3397665940793337
1979	2.341838547881467
1980	2.302190425271628
1981	2.28782819044244
1982	2.4000234174155244
1983	2.4404527285284896
1984	2.4989415382477085
1985	2.6285647155062075
1986	2.6479603204314843
1987	2.6906874004983923
1988	2.741734504854649
1989	2.7182403744920856
1990	2.324511576706441
1991	2.4908265871872115
1992	2.5273310619016582
1993	2.6032827597879384
1994	2.6215807262509916
1995	2.71991435533202
1996	2.6503271738285235
1997	2.7009724855519277
1998	2.7639066792382994
1999	2.6632461062981525
2000	2.703317755200008
2001	2.751959571751517
2002	2.778845214094913
2003	2.843241172763216
2004	2.897422661591192
2005	2.978802157055997
2006	3.0238079714911676
2007	3.0534098077645915
2008	3.047664637924095
2009	3.0548339434465284
2010	3.051080843747566
2011	3.1435798393530208
2012	3.1087269070440686
2013	3.1192495093270316
2014	3.078468072885882