Year	% of total fuel combustion
1992	0
1993	2.753529326947313E-16
1994	-1.4084507042253522
1995	4.448008912761044E-16
1996	-1.224510688924805E-15
1997	-1.2500000000000007
1998	5.880418562633245E-16
1999	-1.5873015873015883
2000	-1.7062853862066955E-15
2001	-1.5534837098299763E-15
2002	-1.5770213417970972E-15
2003	-1.4925373134328366
2004	-1.5770213417970972E-15
2005	-8.972707634362796E-16
2006	-1.0408340855860843E-15
2007	-1.0620755975368206E-15
2008	-2.3255813953488373
2009	-1.1564823173178713E-15
2010	-2.0833333333333335
2011	-1.9607843137254901
2012	-1.8181818181818181
2013	-1.8181818181818181
2014	-1.7857142857142856