Year	% of total fuel combustion
1991	0.8849557522123895
1992	0.8130081300813009
1993	1.3986013986013988
1994	1.2121212121212124
1995	1.1173184357541899
1996	10.416666666666668
1997	10.152284263959393
1998	9.405940594059405
1999	10.101010101010102
2000	8.421052631578949
2001	10.288065843621398
2002	10.849056603773585
2003	10.267857142857142
2004	9.82905982905983
2005	8.835341365461847
2006	9.6
2007	9.266409266409266
2008	8.561643835616438
2009	8.053691275167784
2010	8.469055374592834
2011	8.626198083067093
2012	8.641975308641976
2013	8.720930232558139
2014	9.192200557103066