Year	% of total fuel combustion
1960	29.332322287472802
1961	28.696110845260364
1962	27.834746003656456
1963	27.854091625623813
1964	28.494065375272186
1965	28.536029962546817
1966	28.45249324932493
1967	29.449073945904043
1968	28.81431732232805
1969	28.112668878382824
1970	26.07106453462445
1971	25.2024934340066
1972	24.473495978574075
1973	24.455884081201724
1974	24.29813258627597
1975	22.648099907748698
1976	22.236709456280664
1977	22.256377170657416
1978	21.463147505256455
1979	22.23683617448999
1980	21.888836700708627
1981	21.41239712668284
1982	20.247271827102264
1983	19.44380833557068
1984	19.470983561457373
1985	19.090910818318974
1986	18.502954557933386
1987	18.314896179597618
1988	18.23426643730033
1989	17.67989401900148
1990	16.910845166644425
1991	16.13201656398201
1992	15.06026113747083
1993	14.961733657874534
1994	15.10261647281405
1995	14.742397131683646
1996	14.392253533848912
1997	14.281286436303358
1998	13.868473397127014
1999	13.633406967083783
2000	14.109458114957658
2001	13.752247633946517
2002	13.212110815678873
2003	13.035219343442341
2004	13.03759739768515
2005	12.475594896761983
2006	12.7665320610098
2007	12.59383815410439
2008	12.525798435848273
2009	11.795954620695223
2010	12.527300548141548
2011	12.740984434701918
2012	12.638108543861676
2013	12.64104454370203
2014	12.817811121199089