Year	% of total fuel combustion
1985	48.302207130730054
1986	46.71875
1987	47.71386430678466
1988	48.160999306037475
1989	48.02631578947369
1990	51.555209953343706
1991	56.16065350578625
1992	62.558502340093604
1993	61.064189189189186
1994	64.5631067961165
1995	64.39024390243902
1996	67.70472895040369
1997	64.89988221436984
1998	73.47417840375587
1999	71.56177156177156
2000	73.38530066815144
2001	71.65178571428571
2002	73.11715481171548
2003	70.11866235167207
2004	69.95798319327731
2005	69.72727272727272
2006	61.3452188006483
2007	62.22910216718266
2008	61.89735614307932
2009	61.40221402214022
2010	63.03886925795052
2011	59.91019884541373
2012	58.75509016870273
2013	59.75348338692389
2014	63.8215859030837