Year	% of total electricity output
1990	63.4757182812103
1991	63.9740491031675
1992	66.7198491551236
1993	79.3241945341832
1994	89.5850844349354
1995	77.8298914945747
1996	77.9134083539958
1997	76.5418270913546
1998	79.8313930148535
1999	85.9002476123099
2000	85.8951175406872
2001	85.9076607887612
2002	85.9084046300956
2003	85.9068540047072
2004	85.8794003038109
2005	85.8773755959976
2006	85.8775735040969
2007	85.8799730276467
2008	85.8766646874205
2009	92.1862311648471
2010	91.801652892562
2011	93.2774772397414
2012	93.479694092827
2013	93.476554136036
2014	91.2572055997804
2015	85.1880276285495