Year	kg per kg of oil equivalent energy use
1990	3.040268056534025
1991	3.0085091305010816
1992	2.7714488552209176
1993	2.612176982095865
1994	2.344103684537326
1995	1.9293966650798078
1996	2.0927050189014422
1997	2.1941519872500104
1998	2.184113921643555
1999	1.9854963429976022
2000	2.0139718759824583
2001	1.8418419161465511
2002	2.0520824301280385
2003	2.168012010553836
2004	2.1877102621711058
2005	2.0592304616911257
2006	2.1001851479011964
2007	2.1905760537872756
2008	2.3773172908206113
2009	2.3435904707392674
2010	2.306255472816875
2011	2.301883224436937
2012	2.433610335925314
2013	2.3756813304625917
2014	2.5583479869674433