Year	% of total fuel combustion
1965	9.505182867201253
1966	10.779245644265748
1967	11.577341216860576
1968	11.630105900151285
1969	12.120661457386879
1970	11.649326283472625
1971	11.879873900779824
1972	10.785576303927883
1973	10.582568116814691
1974	10.991567316080255
1975	10.898988459894571
1976	10.19629225736096
1977	10.59266961268521
1978	10.467994813155725
1979	10.359712230215827
1980	10.250514341038365
1981	9.984093967943227
1982	9.710038986354776
1983	9.571756308947235
1984	9.503105590062113
1985	9.70289582549831
1986	10.398569238630557
1987	10.703904966510807
1988	11.427420437760173
1989	12.111248116180299
1990	12.78928136419001
1991	11.582098959974786
1992	12.438768369489155
1993	12.375806170472373
1994	12.22398869457693
1995	12.637753288304301
1996	12.397558849171752
1997	13.487372380440624
1998	14.962593516209477
1999	15.749559082892414
2000	16.644773878776505
2001	17.003458947751685
2002	18.36471022517534
2003	18.316308559351885
2004	19.75667332485927
2005	21.546052631578945
2006	23.26440177252585
2007	24.695354150799695
2008	24.88888888888889
2009	27.309579688500108
2010	24.49022493167963
2011	24.437158469945356
2012	25.675675675675674
2013	24.125184820108426
2014	27.15988083416087