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
1998	0
1999	0
2000	0
2001	0
2002	0.032592390563207424
2003	0.03754563005200675
2004	0.048959667363678676
2005	0.05960355123634795
2006	0.0774136867398156
2007	0.08983916736877268
2008	0.10841799380092926
2009	0.11960001438797166
2010	0.4769092254001518
2011	0.6602197746574608
2012	0.8206591163795065
2013	1.0015519952923289
2014	1.466562640877227