Year	kg per kg of oil equivalent energy use
1990	3.0301502573237085
1991	3.053456158848953
1992	3.0786082946254303
1993	3.1006322775820094
1994	3.0450307824996607
1995	3.0154015766710534
1996	2.958549562789915
1997	2.8939093169084638
1998	2.8471251111095843
1999	2.8776920719364925
2000	3.011669197296877
2001	2.921764169395563
2002	2.7919399827829188
2003	2.7637774825276114
2004	2.7140573682337132
2005	2.670326972859264
2006	2.6224114369146854
2007	2.686145680567806
2008	2.6307052015430146
2009	2.6381985183514507
2010	2.5665998069632194
2011	2.593215561125301
2012	2.515041907821567
2013	2.448521048711672
2014	2.420650647112113
2015	2.4806045246491832