Year	% of total fuel combustion
1960	26.912568306010925
1961	26.474127557160042
1962	27.171492204899778
1963	27.62201453790239
1964	27.568042142230027
1965	29.96078431372549
1966	30.006978367062104
1967	35.66477630749843
1968	36.09813084112149
1969	34.35710567412805
1970	31.699346405228763
1971	34.79648842777335
1972	36.31651693158259
1973	38.67141162514828
1974	41.47551146931185
1975	43.548387096774185
1976	43.523049188771566
1977	43.980099502487555
1978	42.56915142991093
1979	42.94943194475385
1980	43.77074574020801
1981	46.56368927691963
1982	45.77893820713664
1983	47.1617497456765
1984	46.607669616519175
1985	49.0001834525775
1986	49.981610886355284
1987	51.01086048454469
1988	51.84025058731402
1989	52.80523255813955
1990	53.13304721030041
1991	51.87455452601568
1992	53.772802653399665
1993	53.902574038195404
1994	54.78543387031271
1995	55.14177446752908
1996	51.0925029438702
1997	50.46511627906977
1998	50.12996658002228
1999	51.6280217069561
2000	54.31916344623777
2001	53.54051054384018
2002	53.276510958600845
2003	52.39616613418531
2004	53.42099636519136
2005	53.229702762314886
2006	51.949017525225706
2007	53.28705594120049
2008	54.32203389830508
2009	53.608247422680414
2010	54.30352433469191
2011	55.10526956310089
2012	59.57943925233644
2013	60.328059224851216
2014	58.1056466302368