Year	kg per kg of oil equivalent energy use
1991	1.6124666708897937
1992	1.650368153846778
1993	1.7843724161156473
1994	1.9123379614244118
1995	1.8846990125029015
1996	1.9030608553267367
1997	1.9101455880000193
1998	1.8771193095174596
1999	1.846267462613084
2000	1.9024960944893319
2001	2.0347041118392486
2002	1.9030481828570203
2003	1.9460389962210838
2004	1.9459738781624119
2005	1.90853515023868
2006	1.9126851690090783
2007	1.9171330226894887
2008	2.0336975438292737
2009	2.0449304284972865
2010	2.0344795534804874
2011	2.0901970388455564
2012	2.1507205521397847
2013	2.1994510584714275
2014	2.2151055802386