Year	kg per kg of oil equivalent energy use
1971	0.9729095251976465
1972	1.2062018472902498
1973	1.3812200549074214
1974	1.6821656011738233
1975	1.2291483148618234
1976	1.3611078857479886
1977	1.182455901264702
1978	1.0790553241188434
1979	1.5073715404216574
1980	1.394937183388222
1981	1.2918969099691135
1982	1.2240604285450347
1983	1.0874269218494825
1984	1.2604987325914858
1985	1.2242005281682957
1986	1.2755299643280302
1987	0.9951525624007623
1988	1.1521874172624071
1989	0.6678797500847993
1990	1.021506882690556
1991	1.085691720960591
1992	1.1940794060317346
1993	1.1481287222456273
1994	1.122889826757607
1995	1.10648324411334
1996	1.1348003541493485
1997	1.051793462714589
1998	0.9583505886040761
1999	0.9013269268377142
2000	0.8840886862170168
2001	0.9425545490853905
2002	0.9235965852818367
2003	0.9000094019926703
2004	0.874747757458335
2005	0.9347606481454094
2006	0.8683151727537993
2007	0.8199045497561437
2008	0.8086367386437293
2009	0.6664633522539263
2010	0.7568184247624848
2011	0.8051280624440574
2012	0.7538526960600482
2013	0.8262603509500542
2014	0.8626038116220557