Year	kg per kg of oil equivalent energy use
1971	2.186182740186835
1972	1.8476542229654926
1973	1.9344755646617273
1974	1.9589557687959749
1975	1.9992217392229412
1976	1.9862380071838168
1977	1.9832932107816625
1978	1.846241152979044
1979	1.8972272504416194
1980	1.8686830940360633
1981	1.8794607275525992
1982	1.8056848270596997
1983	1.872702419953113
1984	1.9574852234877682
1985	1.9836192901515104
1986	2.1165046643454817
1987	2.3348450569950265
1988	2.5474016245559787
1989	2.615703694952334
1990	1.68335742733228
1991	1.6325389243067145
1992	1.5370169955727289
1993	1.4542035907153181
1994	1.3855526225968042
1995	1.346032356703447
1996	1.2886389666133515
1997	1.2226812415883115
1998	1.1748252559410062
1999	1.1898303075304855
2000	1.2109150227144192
2001	1.2215126464651131
2002	1.1916906792648179
2003	1.2089313143240787
2004	1.2216855258380501
2005	1.280449154017968
2006	1.2884253904689056
2007	1.2452896899916988
2008	1.2841864570683135
2009	1.1560655709454732
2010	1.1164947177888904
2011	1.0177270015044657
2012	0.9736438813896481
2013	0.8550101019575378
2014	0.754403711448565