Year	kg per kg of oil equivalent energy use
1971	2.8886982021219616
1972	3.0017414527059074
1973	3.0157733481501476
1974	2.9574334341457624
1975	2.9719280444168437
1976	2.6410153300301014
1977	3.0719272680777143
1978	2.6421715325344644
1979	2.642390046209368
1980	2.4980311347536657
1981	2.6940361057382334
1982	3.4222544069393583
1983	3.782188092151192
1984	3.572663477181059
1985	3.4595067527034646
1986	3.002857589562832
1987	2.9911220436529233
1988	3.8699139060736587
1989	4.106167308558174
1990	2.8763060451047777
1991	2.9110974010185533
1992	2.86462679666577
1993	2.94271309601335
1994	2.930206739475501
1995	3.0163490655214518
1996	3.036784449598949
1997	3.071966675732111
1998	3.1495623465072904
1999	3.1548014577665078
2000	3.193362045740683
2001	3.2106957800165836
2002	3.2217690573187916
2003	3.327288409015289
2004	3.381884560845834
2005	3.427034023030541
2006	3.385320142195961
2007	3.5620365950149004
2008	3.4360249353029277
2009	3.2970427992856006
2010	3.273534881489571
2011	3.337310373646404
2012	3.2742650160540783
2013	3.2864876850752873
2014	3.328157829945013