Year	% of total fuel combustion
1971	48.913043478260875
1972	50.14749262536873
1973	46.1756373937677
1974	50.17301038062283
1975	49.621212121212125
1976	53.15985130111523
1977	53.79310344827587
1978	54.79041916167665
1979	56.62983425414364
1980	57.4585635359116
1981	55.319148936170215
1982	52.13270142180095
1983	46.846846846846844
1984	60.99476439790577
1985	70.11494252873564
1986	71.42857142857143
1987	63.38383838383837
1988	67.10875331564986
1989	66.85236768802228
1990	67.8474114441417
1991	65.70680628272251
1992	57.0264765784114
1993	62.16216216216217
1994	64.56400742115028
1995	67.88990825688074
1996	63.53383458646616
1997	58.74213836477987
1998	59.03030303030303
1999	59.34065934065935
2000	48.95437262357415
2001	50.19230769230769
2002	48.40474020054694
2003	47.36401673640167
2004	47.441104792851334
2005	47.12471994025392
2006	50.84889643463498
2007	50.81206496519722
2008	49.66996699669967
2009	47.57785467128027
2010	55.80645161290322
2011	50.306748466257666
2012	45.89041095890411
2013	56.18631732168849
2014	47.72998805256871