Year	% of total electricity output
1990	81.0526315789474
1991	80.8510638297872
1992	81.25
1993	80.4123711340206
1994	79.2079207920792
1995	79.4117647058823
1996	78.8461538461538
1997	78.8461538461538
1998	78.8461538461538
1999	78.5046728971963
2000	78.5046728971963
2001	76.8518518518518
2002	76.8518518518518
2003	76.3636363636364
2004	83.3333333333333
2005	83.75
2006	83.8323353293413
2007	85.0931677018634
2008	85.0931677018634
2009	85
2010	84.375
2011	84.4827586206897
2012	84.6590909090909
2013	99.2805755395683
2014	99.4152046783626
2015	99.4152046783626