Year	kg per kg of oil equivalent energy use
1971	1.869573288989155
1972	2.0596315280748647
1973	2.0765604100750568
1974	2.0055035459155337
1975	2.3078070291519355
1976	2.2106864674891025
1977	2.1956585084848945
1978	2.162995190457909
1979	2.179859151482957
1980	2.1446130229533305
1981	2.2239537987704074
1982	2.3151831549370745
1983	1.9610387463497327
1984	2.1187265635514376
1985	2.1300876054136673
1986	2.202428123920691
1987	2.1368717437769362
1988	2.1352608253503513
1989	1.951470027419952
1990	2.034098639250624
1991	1.9042442153288535
1992	1.750278309305633
1993	1.9057723177890993
1994	1.989139720542898
1995	2.124972505636287
1996	2.1104442792963476
1997	2.2486101086513632
1998	2.35934495829431
1999	2.341793465428548
2000	2.2139583479065963
2001	2.184837229626393
2002	2.2386419963029636
2003	2.186539651505618
2004	2.2140888226465196
2005	2.4237039369724505
2006	2.4688173351153875
2007	2.682171722889062
2008	2.4434958987161197
2009	2.3743412736211913
2010	2.4516249671671835
2011	2.459188796852652
2012	2.40563390287793
2013	2.3715070237794955
2014	2.2976138152236407