Year	kWh
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	3000000
1979	638000000
1980	2077000000
1981	3114000000
1982	3962000000
1983	5139000000
1984	5576000000
1985	6143000000
1986	5804000000
1987	5625000000
1988	6233000000
1989	6716000000
1990	7091000000
1991	6883000000
1992	6916000000
1993	6905000000
1994	8765000000
1995	11724000000
1996	11393000000
1997	13131000000
1998	14721000000
1999	17226000000
2000	20187000000
2001	20311000000
2002	20648000000
2003	20933000000
2004	22191000000
2005	25579000000
2006	29860000000
2007	34875000000
2008	51633000000
2009	72110000000
2010	94270000000
2011	125890000000
2012	158917000000
2013	223128000000
2014	261883000000
2015	319166000000