Year	kg per kg of oil equivalent energy use
1971	0.6964222645139821
1972	0.6997695777169671
1973	0.6899433774536629
1974	0.8393809899013843
1975	0.8234081597532482
1976	0.7271020353693757
1977	0.7598814554436832
1978	0.7764159006137998
1979	0.708881571542413
1980	0.8403526231195655
1981	0.8605270086216704
1982	0.6073471018654947
1983	0.5924823406014194
1984	0.518882328641755
1985	0.4338780870431947
1986	0.439611202845422
1987	0.5246528601645504
1988	0.4735606692558186
1989	0.4951603240983647
1990	0.5731933347510689
1991	0.5397217821265038
1992	0.5312409878760985
1993	0.5104730604375712
1994	0.5057744013530973
1995	0.5238240438032027
1996	0.5529611426192301
1997	0.5205794299937483
1998	0.541126072776771
1999	0.5539119793190417
2000	0.5878828837291232
2001	0.5362941846330503
2002	0.5160376073186095
2003	0.4444024920022864
2004	0.4809647051527762
2005	0.5205466251987435
2006	0.5573951593646702
2007	0.5496047948531182
2008	0.5614940205702853
2009	0.6265363114442983
2010	0.6475538218918582
2011	0.6539428033418836
2012	0.601418166844704
2013	0.6609685551944605
2014	0.6360540039049399