Year	% of total electricity output
1990	94.8775699373914
1991	94.8801191271127
1992	94.5899169640325
1993	95.5341550418818
1994	96.5365867724356
1995	96.1879074395557
1996	96.6688275388492
1997	96.5920046209247
1998	92.4580678212536
1999	91.4756034219475
2000	90.9088380274609
2001	90.7550491299177
2002	90.5991807969466
2003	90.9039016083618
2004	100
2005	100
2006	100
2007	100
2008	100
2009	100
2010	100
2011	100
2012	100
2013	99.9651873436654
2014	99.9667487290981
2015	86.3699995757859