Year	kg per kg of oil equivalent energy use
1960	2.242568970741477
1961	2.0927198736055925
1962	2.1711386125168617
1963	2.144064066431476
1964	2.094818316232806
1965	2.1093835634018228
1966	2.1018164449376955
1967	2.0224417434345443
1968	2.0174700821838805
1969	1.7506195799725184
1970	1.6063628377909798
1971	1.6336410815627005
1972	1.61246665428926
1973	1.566854475453901
1974	1.5770329426570515
1975	1.4628063065915278
1976	1.522988788070142
1977	1.5344195070293898
1978	1.5081018835851177
1979	1.3514279478090703
1980	1.2469847602873572
1981	1.0581119911141161
1982	0.966141782720042
1983	0.9001657263485117
1984	1.0062883144789232
1985	0.919503332614213
1986	0.9655629754947362
1987	0.9585930616939621
1988	0.9388383135160616
1989	0.9428523869138238
1990	0.8590546786100232
1991	0.9198661715121781
1992	0.9631532154499655
1993	0.9100900023855389
1994	0.947320804524658
1995	0.9057339297893172
1996	0.9540577083029498
1997	0.9237815750690689
1998	0.8681719287307569
1999	0.7613747411056526
2000	0.7149729769070141
2001	0.7157866412341487
2002	0.7210494617397958
2003	0.7177468542249702
2004	0.7547513549738765
2005	0.7332483960591581
2006	0.6023221198016111
2007	0.5180262243158027
2008	0.419962877593343
2009	0.3917446226088261
2010	0.3620200348536636
2011	0.3262824107194648
2012	0.32895632768719296
2013	0.34491974838868955
2014	0.34950209590439807
2015	0.3562608521206168