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	2000000
1987	3000000
1988	6000000
1989	6000000
1990	32000000
1991	39000000
1992	88000000
1993	99000000
1994	200000000
1995	530000000
1996	924000000
1997	1039000000
1998	1129000000
1999	2421000000
2000	2964000000
2001	3983000000
2002	5178000000
2003	6862000000
2004	8547000000
2005	11025000000
2006	15353000000
2007	19258000000
2008	23259000000
2009	30514000000
2010	34065000000
2011	42495000000
2012	52150000000
2013	59079000000
2014	66931000000
2015	74143000000