Year	kg per kg of oil equivalent energy use
1990	2.3910198489023142
1991	2.3244625356102255
1992	2.2880825295153637
1993	2.2285744173301225
1994	2.1406759215641262
1995	1.9580869316625484
1996	1.992812603953599
1997	1.9250394599237475
1998	1.878105631313773
1999	1.8981490909374317
2000	1.8085565865516986
2001	1.790119222913137
2002	1.8043761645591063
2003	1.7552663772828292
2004	1.7169049116323463
2005	1.7049036961296258
2006	1.7487867791719494
2007	1.7784545959290694
2008	1.7683361853477975
2009	1.6716270382039458
2010	1.8904266972625867
2011	1.855909969102623
2012	1.7143514542773184
2013	1.7167508565895466
2014	1.677360995043721