Year	kg per kg of oil equivalent energy use
1990	2.3695794338018668
1991	2.2928869750701635
1992	2.486617231501545
1993	2.507226303244584
1994	2.4191340886387795
1995	2.3846843605741634
1996	2.4176791323931526
1997	2.3926465286851393
1998	2.403905058467624
1999	2.3188194829359148
2000	2.26725228514549
2001	2.2834650111693806
2002	2.272270076867734
2003	2.230815313809311
2004	2.2028349686800617
2005	2.184165608290122
2006	2.2272210658242826
2007	2.2234468609841005
2008	2.242417013484805
2009	2.177769058599376
2010	2.156293205139588
2011	2.1475842271475125
2012	2.153668583483761
2013	2.127757869315735
2014	1.9736090851355317
2015	2.0102426211732123