Year	kWh
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	2000000
1993	1000000
1994	0
1995	0
1996	0
1997	11000000
1998	11000000
1999	0
2000	0
2001	0
2002	3000000
2003	3000000
2004	4000000
2005	6000000
2006	4000000
2007	38000000
2008	29000000
2009	19000000
2010	417000000
2011	1587000000
2012	2860000000
2013	5192000000
2014	8322000000
2015	9569000000