Year	kg per kg of oil equivalent energy use
1990	2.0762093165653996
1991	2.0056271943326536
1992	1.8512354884980833
1993	1.5905714867866971
1994	1.2177937756671138
1995	1.1280498355339292
1996	1.0427116087783284
1997	1.1723438937697628
1998	1.2262056133560448
1999	1.13475430782221
2000	1.023893008765455
2001	1.013767433263454
2002	1.001234385679246
2003	1.000907735679178
2004	1.100388249388922
2005	1.0469651471712496
2006	1.106572918803658
2007	1.2602682781555568
2008	1.2348063799144682
2009	1.1208522604166569
2010	1.1121492191747393
2011	1.1639677736733403
2012	1.274091623806338
2013	1.2148309328248472
2014	1.5937289084953594