Year	kg per kg of oil equivalent energy use
2000	0.45605129011464585
2001	0.43633132620923276
2002	0.44573097970395825
2003	0.4633999409774812
2004	0.46063549039021073
2005	0.4384340520190465
2006	0.42189416981634104
2007	0.44087988872621736
2008	0.4416130996823467
2009	0.5231141372079945
2010	0.6147599833431455
2011	0.7284875307217658
2012	0.8303487640544217
2013	0.6241970872662399
2014	0.6860017531155913