Year	% of total fuel combustion
1960	42.2718222781096
1961	44.38752448395359
1962	43.936522974893414
1963	44.53919317809118
1964	45.551745917170436
1965	44.86996793729961
1966	45.986290406764326
1967	47.21141813508302
1968	48.93804443574435
1969	48.84400097347286
1970	47.721369539551354
1971	39.57025759494552
1972	41.03860543295559
1973	41.6918901993529
1974	42.74128660647007
1975	41.86992364924928
1976	42.75356462506494
1977	43.11470692403046
1978	44.54723563862667
1979	43.531747656281986
1980	43.69447574954565
1981	45.016675960314366
1982	45.37886226419035
1983	46.637646665831554
1984	47.106513551512165
1985	47.54991659505636
1986	47.64997824969352
1987	46.73858697742395
1988	46.43853250375456
1989	48.49242431879354
1990	54.12977995609333
1991	55.03347521503945
1992	58.85043396837973
1993	57.851983334565986
1994	56.87288717179677
1995	55.23008324175477
1996	55.09593575675841
1997	54.406455454073296
1998	55.67307951755214
1999	55.54381656720255
2000	55.959537572254334
2001	56.447536561124515
2002	55.490275526742295
2003	56.078827550893315
2004	54.74037967476286
2005	54.11246971005208
2006	53.84520884520885
2007	54.62085629734206
2008	53.70699716556438
2009	53.45959066255133
2010	53.82506169454347
2011	54.96655252625951
2012	54.0620628450234
2013	53.38370513761182
2014	52.399909376314845