Year	kg per kg of oil equivalent energy use
1990	3.4156996213518136
1991	3.3942203266937065
1992	3.5896602500084853
1993	3.615308511272613
1994	2.2019954538549555
1995	2.255405611609784
1996	2.4008269387680263
1997	3.1509833183454408
1998	3.2130998918714244
1999	3.174550485763559
2000	3.2096782728939797
2001	3.2760921934246734
2002	3.304400912795362
2003	3.3780335525569507
2004	3.237572980550857
2005	3.220252790836149
2006	3.3792165915572414
2007	3.561405301497751
2008	3.48232285024435
2009	3.3116364051615848
2010	3.2153909222602097
2011	3.3223465450954666
2012	3.285444538150429
2013	3.385495267743869
2014	2.491050622647625