Year	% of total fuel combustion
1960	33.619141095205464
1961	33.84663216225608
1962	33.2317335675294
1963	32.84623316362699
1964	34.0219384206866
1965	33.91949551358474
1966	33.714130504250015
1967	33.6959684458957
1968	34.67667930992292
1969	35.11187365519569
1970	37.4078298773781
1971	39.028205154417854
1972	39.45408438329906
1973	39.00287959856685
1974	40.645255616745445
1975	39.88905439416507
1976	41.31190860162823
1977	41.05035715695173
1978	41.185865442204026
1979	41.37313052654561
1980	43.15365758272367
1981	43.92308146515244
1982	44.79801399232678
1983	44.59386105961757
1984	44.12405497936767
1985	42.63373748233092
1986	42.707940353036946
1987	42.45152493433058
1988	43.02815407461284
1989	44.485617579778705
1990	43.826773160900586
1991	44.62651442517214
1992	44.766852364514634
1993	44.11096839304555
1994	44.829030981587955
1995	44.3112444408129
1996	43.98805162599335
1997	43.7859649122807
1998	44.19664466771348
1999	44.07935904199846
2000	44.83505662235353
2001	45.39004533593082
2002	46.32950697424237
2003	46.84225914916426
2004	47.190536544148706
2005	47.761706238242915
2006	47.57209884266499
2007	51.181502829868805
2008	48.058095889174105
2009	47.666976718357375
2010	47.681421060260654
2011	48.46918543435753
2012	48.99970461075754
2013	48.44866860419449
2014	48.46737732796881