Year	kg per kg of oil equivalent energy use
1971	0.8856227413479147
1972	1.0871097898769764
1973	1.1815893623531963
1974	1.1548856369031215
1975	1.0713807664998591
1976	0.8067743239254778
1977	0.8804234016587382
1978	1.225389057355764
1979	1.2290932095107134
1980	1.1716895055222847
1981	1.1496381472739832
1982	1.026272180781703
1983	1.0985120005016404
1984	1.0646923541264592
1985	0.9420629824945312
1986	0.9233450885524399
1987	1.1250156927551025
1988	0.9536468984321745
1989	0.9108534574493233
1990	1.0759531108813025
1991	1.0839899662037493
1992	1.0515658508859813
1993	1.099835056620784
1994	1.0519800812524884
1995	1.696473773821647
1996	1.7449895782370897
1997	1.7556939189378307
1998	1.7061153958232735
1999	1.8071740954379354
2000	1.7203888329101902
2001	1.7198176007545352
2002	1.7343063105829357
2003	2.1252237031002306
2004	2.2124266811088007
2005	2.161199618888291
2006	2.2001897961168275
2007	2.3821263251021354
2008	2.349681294026076
2009	2.3405690970912025
2010	2.344727547672223
2011	2.331088467181147
2012	2.181169291328363
2013	2.3634960412881587
2014	2.36015839981942