Year	kg per kg of oil equivalent energy use
1971	1.9276007425892638
1972	1.9235326588652062
1973	1.8943572281347263
1974	1.8699253137671337
1975	1.8590258177933408
1976	1.8809217609694735
1977	1.8919573421277907
1978	1.8623182624157564
1979	1.9487456632820985
1980	1.9537742839506265
1981	2.0414522073087187
1982	2.069952474221473
1983	2.114694448687186
1984	2.1348047244632986
1985	2.1511218032193993
1986	2.1319065592294026
1987	2.078187101174456
1988	2.0909185497781513
1989	2.1021801755566054
1990	1.6081976405227825
1991	1.5248838873410513
1992	1.5350015296677932
1993	1.5043306813468804
1994	1.4841833241297917
1995	1.5071523998675804
1996	1.5220369957304387
1997	1.5581201754953826
1998	1.579455060677854
1999	1.476512324873597
2000	1.4932917460683175
2001	1.605759735455547
2002	1.643916664606822
2003	1.6718141328861884
2004	1.7069343959933798
2005	1.6875859612824542
2006	1.6863653362672661
2007	1.6935843149161964
2008	1.7106656731099148
2009	1.6380673520507933
2010	1.7064687132530494
2011	1.6460457894059441
2012	1.6855794325654585
2013	1.7078690469302527
2014	1.7508316115593165