Year	% of total fuel combustion
1971	30.19891500904159
1972	32.07236842105263
1973	27.1712158808933
1974	29.82456140350877
1975	17.181208053691275
1976	21.290322580645164
1977	19.444444444444446
1978	18
1979	18.857142857142858
1980	19.571865443425075
1981	19.785276073619634
1982	25.31418312387792
1983	26.763110307414102
1984	26.053639846743298
1985	28.90792291220557
1986	28.28054298642534
1987	31.98294243070362
1988	33.47022587268994
1989	28.095238095238095
1990	27.900552486187845
1991	27.184466019417474
1992	45.69620253164556
1993	58.71446229913474
1994	49.69325153374233
1995	62.30677764565991
1996	57.58266818700114
1997	58.48214285714285
1998	57.61099365750527
1999	56.46817248459959
2000	56.28192032686415
2001	56.5749235474006
2002	56.770310932798395
2003	57.78210116731517
2004	44
2005	41.73151750972763
2006	31.26064735945485
2007	31.659574468085104
2008	28.55670103092784
2009	38
2010	41.125541125541126
2011	40.08207934336526
2012	40.46579330422125
2013	36.202185792349724
2014	35.425383542538356