Year	kg per kg of oil equivalent energy use
1971	0.3006869658298039
1972	0.31280298143716334
1973	0.3190732964899327
1974	0.33717127492734944
1975	0.382933101947247
1976	0.3547278171354968
1977	0.4749731998716263
1978	0.5879537984324028
1979	0.5178392078544417
1980	1.0683615367906985
1981	1.3923152435670019
1982	1.580551466814426
1983	1.5855151132364884
1984	1.4116739609211897
1985	1.4527437581291593
1986	0.4409684980816962
1987	0.4002626172712412
1988	0.4627460217975628
1989	1.5486065937382671
1990	0.5822299406727767
1991	0.526925704668681
1992	0.49765365154842084
1993	1.2661813605175753
1994	1.3394776588355914
1995	1.2839722163581673
1996	1.11732158630058
1997	1.129228846365074
1998	1.1259018040411215
1999	1.077570890777613
2000	1.061864208804978
2001	0.9915188329838999
2002	0.9517438334038215
2003	0.8969312746260937
2004	0.9325748391308403
2005	0.9369848620952484
2006	1.0337599216781836
2007	1.2808144718154566
2008	1.2837761344609298
2009	1.271330216380692
2010	1.2904059252454498
2011	1.1870231707816556
2012	1.0196054531272498
2013	1.0128637823274647
2014	1.019335411725356