Year	% of total electricity output
1990	82.441113490364
1991	81.5677966101695
1992	81.2236286919831
1993	79.3478260869565
1994	78.4046692607004
1995	70.6766544117647
1996	61.7697123519459
1997	66.1993973750734
1998	66.2329553018441
1999	64.357051807534
2000	60.2310502057446
2001	63.7694115313518
2002	58.8501810481183
2003	42.3316268283762
2004	45.0195712223374
2005	41.1571519176514
2006	40.6257886942319
2007	61.224548384087
2008	64.9426400273446
2009	60.1295207808297
2010	50.2938926133513
2011	57.5939271548141
2012	66.2311586562818
2013	62.1276967930029
2014	47.1662981496567
2015	45.0158848200176