Year	kWh
1971	37000000
1972	38000000
1973	38000000
1974	39000000
1975	39000000
1976	39000000
1977	40000000
1978	40000000
1979	40000000
1980	40000000
1981	40000000
1982	42000000
1983	42000000
1984	42000000
1985	42000000
1986	42000000
1987	43000000
1988	43000000
1989	43000000
1990	47000000
1991	52000000
1992	53000000
1993	53000000
1994	54000000
1995	55000000
1996	54000000
1997	55000000
1998	56000000
1999	57000000
2000	60000000
2001	70000000
2002	78000000
2003	66000000
2004	162000000
2005	177000000
2006	827000000
2007	254000000
2008	254000000
2009	213000000
2010	222000000
2011	219000000
2012	196000000
2013	222000000
2014	233000000
2015	280000000