Year	kg per kg of oil equivalent energy use
1990	2.5752264512730827
1991	2.546496954357642
1992	2.636422773754012
1993	2.2987100770159095
1994	1.9875898949188786
1995	2.134232913519788
1996	1.4429690351197328
1997	1.7939271805211734
1998	1.8298917832585468
1999	1.6962445908341706
2000	1.7671001687679937
2001	1.7948443097203284
2002	1.662777969044617
2003	1.7665909388017567
2004	1.7949593150511634
2005	1.7752600397721936
2006	1.754872801034945
2007	1.8227412205215423
2008	1.8940976389024353
2009	1.7279892106039534
2010	1.747744141533448
2011	1.8191405996830128
2012	1.9255414659631933
2013	1.89631566553267
2014	1.8521403881856426