Year	% of total energy use
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	0.03906203016026591
1998	0.028684055706105088
1999	0.03599678424384002
2000	0.041207059167688014
2001	0.053763873304163164
2002	0.06011060798580991
2003	0.04380199102245727
2004	0.02323392243741731
2005	0.01894149726821871
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0