Year	% of total electricity output
1990	86.2068965517241
1991	82.6552462526767
1992	88.70116156283
1993	93.6842105263158
1994	93.717277486911
1995	93.75
1996	89.9805447470817
1997	76.3525305410122
1998	80.4248861911988
1999	66.9662921348315
2000	63.1141868512111
2001	62.0879120879121
2002	64.7592067988669
2003	62.2055137844612
2004	78.405017921147
2005	79.6482412060302
2006	80.6110102843315
2007	77.6188995958968
2008	75.4090471607315
2009	65.3431890179514
2010	67.9574233804368
2011	70.9078039285082
2012	60.7994842037395
2013	58.0209347614411
2014	53.1751054852321
2015	53.1749283080705