Year	kg per kg of oil equivalent energy use
1971	0.8419463939893019
1972	0.8756454269854234
1973	0.8924366458625097
1974	0.7469260844635505
1975	0.7050393889738131
1976	0.6781905056157773
1977	0.7125199432118873
1978	0.7986501408716707
1979	0.8534323117821137
1980	0.7520820413841286
1981	0.8721522942186964
1982	0.9195468613582631
1983	0.993225976802026
1984	0.7665380402610059
1985	0.7920368596955076
1986	0.7176314347474619
1987	0.7599855391399258
1988	0.6420255954396294
1989	0.6386676977309619
1990	0.696133666365613
1991	0.7107672124870728
1992	0.9137091352291261
1993	0.8402644142077652
1994	0.9919154592345094
1995	0.9691686148565556
1996	1.2440257745474113
1997	1.1975310184225931
1998	1.2161401716664482
1999	1.2565906526321804
2000	1.3126787594044784
2001	1.3479136594837156
2002	1.3881910321639472
2003	1.4294041918516127
2004	1.4628286377519133
2005	1.553221328817511
2006	1.3663583203679763
2007	1.467535395787493
2008	1.4054402055958244
2009	1.3586038814063728
2010	1.3417137575345646
2011	1.474487634671305
2012	1.4953888179746624
2013	1.443282630721487
2014	1.6431263915226628