Year	% of total fuel combustion
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
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	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0.3215434083601274
2007	2.105246936865057E-16
2008	2.0312921264365426E-16
2009	1.8032468565247475E-16
2010	0.19801980198019836
2011	1.7107726587542474E-16
2012	1.6242729175812802E-16
2013	1.4826696375870148E-16
2014	1.4360293675304696E-16