Year	% of total electricity output
1990	86.4077669902913
1991	92.1424829753798
1992	95.0500883912787
1993	93.9076225559649
1994	95.686374016747
1995	93.9861390565616
1996	95.7204948177867
1997	96.1744452945677
1998	96.3202192209826
1999	97.3291582243507
2000	96.1490163248221
2001	95.3083109919571
2002	93.9539860888176
2003	97.8565705128205
2004	97.5026757046022
2005	98.713944515892
2006	98.3164373642288
2007	97.4825174825175
2008	100
2009	99.9807766243752
2010	99.9867864693446
2011	98.5922214268671
2012	100
2013	100
2014	100
2015	100