Year	% of total fuel combustion
1971	40.83414161008729
1972	44.56048738033072
1973	40.50847457627118
1974	36.349453978159126
1975	33.93432066967161
1976	34.439834024896264
1977	33.41596430342092
1978	34.96257155438133
1979	35.55806938159879
1980	31.45253526496378
1981	24.87128712871287
1982	19.91899852724595
1983	30.082855321861057
1984	31.7643576080521
1985	32.79768177028451
1986	37.00824499411071
1987	34.56818181818182
1988	35.53031839383492
1989	34.680382072005884
1990	31.799961824775718
1991	32.85681346552917
1992	44.67540292212683
1993	52.982695810564664
1994	56.57894736842105
1995	56.44313643052343
1996	54.25815719269445
1997	61.58157456870128
1998	47.916140439504915
1999	30.9903103957957
2000	35.37173666288309
2001	39.42187889359581
2002	38.03754493409666
2003	46.3274399885008
2004	42.35520175679385
2005	37.62132604237867
2006	36.499419953596295
2007	28.260521683469353
2008	39.54130975407571
2009	53.49722615033177
2010	55.492222973625736
2011	50.974377481053764
2012	50.20986774372377
2013	54.71628319893469
2014	65.04289867404098