Year	% of total fuel combustion
1971	1.5384615384615377
1972	1.9736842105263157
1973	1.1904761904761898
1974	1.7751479289940828
1975	0.5208333333333331
1976	0.5128205128205132
1977	0
1978	0.4950495049504955
1979	0
1980	0
1981	0
1982	0
1983	2.013422818791946
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	1.6776822785075506E-16
2001	1.5741592340987362E-16
2002	-0.18083182640144665
2003	1.4676171539566897E-16
2004	1.4626673490529572E-16
2005	1.3877787807814457E-16
2006	1.3303094140926435E-16
2007	1.2534129161682133E-16
2008	-0.16286644951140067
2009	2.848478614083427E-16
2010	-0.17182130584192407
2011	-0.1663893510815305
2012	4.610560733493175E-16
2013	-0.1745200698080271
2014	-0.1700680272108845