Year	% of total fuel combustion
1960	32.30738849550033
1961	32.69523883334625
1962	34.156287616380475
1963	34.19066755972316
1964	34.34646147615672
1965	34.81899497101616
1966	34.679040989945854
1967	34.91099350493145
1968	35.00993455697434
1969	35.20859047148852
1970	37.68728346680297
1971	27.147069664577955
1972	27.561305196472073
1973	29.172098072277365
1974	29.259738834631843
1975	28.92302855819186
1976	29.05118944026574
1977	29.647576448576274
1978	30.40652687991732
1979	30.88757435756064
1980	32.11456695696669
1981	32.09168277218323
1982	31.750722046944727
1983	31.644849542648437
1984	31.95417066270983
1985	33.015022708745775
1986	33.11889492999472
1987	33.684956201039704
1988	34.696825591622186
1989	36.33079974294768
1990	38.01540946353282
1991	39.09532339653676
1992	40.37672396518526
1993	40.99411958220248
1994	42.278467043967645
1995	41.55645704098526
1996	44.46666331889007
1997	44.53961230139328
1998	46.00537823231238
1999	46.874581878778294
2000	48.31257284081235
2001	48.645782763114205
2002	49.90667462476212
2003	50.97570236435645
2004	49.278739833883996
2005	49.637520941117785
2006	50.553092323290414
2007	51.070526046172986
2008	50.4313080361917
2009	50.49146175028091
2010	51.55546171171171
2011	52.551434455816235
2012	52.7814634805904
2013	53.155280315681715
2014	52.44682801255924