Year	% of total fuel combustion
1960	31.32462686567164
1961	32.91226855857415
1962	35.21753460777851
1963	35.326261652201865
1964	30.83543552455854
1965	29.803306727480045
1966	29.25134390979415
1967	27.239029056558657
1968	27.009646302250808
1969	21.826903857685387
1970	21.39125653010723
1971	21.46337365591398
1972	21.73669467787115
1973	23.254144836000858
1974	23.29620790241315
1975	23.30851200410836
1976	23.102348506813573
1977	23.80721724388472
1978	25.312138376271392
1979	26.810142521893425
1980	24.226638023630507
1981	22.371188222923237
1982	22.99934938191282
1983	22.791613452532992
1984	24.883890101281402
1985	25.393063583815028
1986	25.575231220392514
1987	26.90623245367771
1988	31.408240939930497
1989	30.363883436509138
1990	31.184600197433365
1991	31.273470551884774
1992	31.252816584046865
1993	32.84005189064526
1994	32.57111244294869
1995	31.511592233860725
1996	35.225291364595755
1997	32.52618633645732
1998	34.729328271992074
1999	33.51906602986885
2000	32.4309769145155
2001	33.75160875160875
2002	32.34284560506124
2003	33.412659064617415
2004	33.03884711779448
2005	32.73386685849594
2006	34.795051698670605
2007	34.35668186393511
2008	35.461267719332234
2009	36.68345349806167
2010	37.54103366669211
2011	34.690332326283986
2012	31.72707725387805
2013	34.693096261006424
2014	35.30755636018794