Year	kg per kg of oil equivalent energy use
1990	2.0057212233007036
1991	2.0116965871089265
1992	1.812991307713897
1993	1.7288685906096295
1994	1.8238024569488414
1995	1.576789294358101
1996	1.5137716519610256
1997	1.5634592614407141
1998	1.5738818216970578
1999	1.5382554074072585
2000	1.4739038383625336
2001	1.3471051375086263
2002	1.2658412073282053
2003	1.213704375982487
2004	1.2689715779134165
2005	1.4501714095824343
2006	1.4935267316622276
2007	1.3965864720142995
2008	1.3721868855497372
2009	1.3338795126832659
2010	1.7875710187069307
2011	1.6207479834075924
2012	1.6172306504385094
2013	1.6254860138621103
2014	1.5513472365091716