Year	% of total fuel combustion
1960	30.566507075936055
1961	31.311399749456054
1962	31.19784799709763
1963	30.429421697624267
1964	31.917465848217915
1965	31.47607707632922
1966	31.755037546812495
1967	31.947276323797922
1968	31.85504720511717
1969	32.25129193515178
1970	33.44972850972815
1971	34.2754977736705
1972	34.446175058727405
1973	34.85160878150773
1974	36.01202979276531
1975	35.65999929160195
1976	37.03524729283557
1977	36.80799037121259
1978	37.32366418554427
1979	37.503643885060185
1980	38.787406184397675
1981	39.13397502787814
1982	39.684194845821544
1983	39.66102195675617
1984	39.16720566041434
1985	38.94510531853168
1986	39.18750341569819
1987	38.90936630979681
1988	38.6785706699896
1989	40.164752340714635
1990	47.271824953848935
1991	47.485665386293405
1992	48.68987519475014
1993	48.01766528895614
1994	48.52744577994819
1995	47.445231734231626
1996	47.39785853651776
1997	46.98421965198056
1998	47.20140608772069
1999	47.010163043916265
2000	47.51602985965197
2001	47.40950580320021
2002	47.97500845590444
2003	48.220929751654694
2004	47.73121996458984
2005	48.26600407347025
2006	48.932239341669806
2007	48.98032406180882
2008	47.99809153925869
2009	47.97667400405999
2010	48.15214625411131
2011	49.10570572566745
2012	49.5444932226744
2013	48.59561244158926
2014	48.06765603043492