Year	% of total fuel combustion
1971	34.12043947439255
1972	34.96254423456959
1973	34.96300927373137
1974	35.65590802050146
1975	36.76419163072619
1976	36.64051432930151
1977	36.08897223524509
1978	36.149242079240125
1979	36.026889833996435
1980	35.516605166051654
1981	36.76256690714452
1982	36.438478618183915
1983	35.343469877390014
1984	35.0783361916112
1985	34.57378315735256
1986	34.69059627038986
1987	34.15213525493006
1988	34.00366581304353
1989	34.09076666624889
1990	35.570232040284424
1991	35.886988883753745
1992	35.742434821713864
1993	36.3486124819244
1994	36.01665887367746
1995	36.40164699889634
1996	36.185215888774586
1997	35.39197533765051
1998	35.212348242090535
1999	35.2817190565263
2000	34.418796011800026
2001	34.51469294233467
2002	34.50368142423743
2003	34.4092440199548
2004	34.88017888102143
2005	35.06302010211844
2006	35.19304768243331
2007	35.702184640196506
2008	35.38201177590522
2009	35.808437757446995
2010	35.842534415095884
2011	36.48913500999684
2012	37.01348723259162
2013	36.57130003936294
2014	36.93517544992284