Year	% of total electricity output
1990	55.20985135529
1991	57.1351600985222
1992	58.3109198493814
1993	63.1468197034912
1994	61.4296081277213
1995	63.8091734118224
1996	83.4840684569361
1997	84.4199357810973
1998	83.0660930778256
1999	83.8474554210595
2000	78.9331896551724
2001	79.8904425544183
2002	93.2478985806807
2003	91.145251396648
2004	87.3627960716349
2005	85.8125774047062
2006	72.9381089611637
2007	81.8290926548248
2008	84.727315745889
2009	86.6090207992522
2010	92.5227182931648
2011	77.3984696880518
2012	74.5023207839092
2013	82.2248732478378
2014	80.3683347796741
2015	78.0393242869011