Year	kg per kg of oil equivalent energy use
1971	1.892468314247419
1972	2.0440261994766593
1973	2.1791095004158674
1974	2.0760392771249614
1975	2.048930690064427
1976	2.0791254715721466
1977	2.237992888605848
1978	2.311877307349425
1979	2.1396397707102746
1980	1.9608330554943294
1981	1.9080086708484245
1982	1.81340120440148
1983	1.8595679680397774
1984	1.630567511330274
1985	1.7930164165559652
1986	1.9677646504761603
1987	1.953109794361333
1988	2.033292542122111
1989	1.8469318173349463
1990	1.710947620560702
1991	1.7192131622060762
1992	1.8058396066315652
1993	1.7825600803772546
1994	2.0992653869660294
1995	2.040258845646147
1996	1.9133509660099324
1997	1.872666205381851
1998	2.1058292457733447
1999	1.9172515742195093
2000	1.7225875422468946
2001	1.8749440024796307
2002	1.8150658355944933
2003	1.7768747713805522
2004	1.536072092983564
2005	1.62194420667139
2006	1.5683626819575651
2007	1.6857227270025277
2008	1.6398247132051247
2009	1.5786344110728925
2010	1.5303167368223265
2011	1.5961352474353352
2012	1.5742747031171485
2013	1.606463517172228
2014	1.5960917563185766