Year	kg per kg of oil equivalent energy use
1990	3.086180451892431
1991	2.9815229206998533
1992	2.9681817345224366
1993	2.855626823209472
1994	2.77811505482946
1995	2.5730811205153623
1996	2.5647671524352096
1997	2.4750077182521486
1998	2.420798606067781
1999	2.3590810175823753
2000	2.327490788027332
2001	2.300083582809398
2002	2.3194121227078845
2003	2.312447006422769
2004	2.3039741481070397
2005	2.3390241008125106
2006	2.312790076913312
2007	2.4245846930666413
2008	2.4365684983682465
2009	2.40474048632414
2010	2.3665069131939602
2011	2.4188630764172436
2012	2.383256306918909
2013	2.3388947777496183
2014	2.3352830372127804