Year	kg per kg of oil equivalent energy use
1971	2.0391609963636514
1972	1.9904693529865005
1973	2.0773276866333865
1974	2.122888940348185
1975	2.1212164522803967
1976	2.133952896796433
1977	2.14176707571724
1978	2.123375009465689
1979	2.1130445985365176
1980	2.1426588287503883
1981	2.1278385337972994
1982	2.052612487710159
1983	1.928653293534643
1984	1.904781634165313
1985	1.8442298756796258
1986	2.0275149395689174
1987	2.330352876227274
1988	2.307395028614127
1989	2.1747013708374476
1990	2.119317688597958
1991	2.068319905311791
1992	2.227949251860241
1993	2.1727328682434215
1994	2.1772737027791593
1995	2.3151547202404408
1996	2.454927652202417
1997	2.5553320820891514
1998	2.315477156913907
1999	2.35292485937725
2000	2.326196391523645
2001	2.234833526097616
2002	2.3203284608120107
2003	2.3148599660091946
2004	2.4311142231444407
2005	2.29759153044001
2006	2.3459110800067386
2007	2.3794710040425895
2008	2.564664326277447
2009	2.644357291751788
2010	2.441244986729045
2011	2.5568365878789416
2012	2.365646026775963
2013	2.431026615372267
2014	2.2209681175211338