Year	% of total electricity output
1990	23.4949616742744
1991	22.0379341489449
1992	21.015761821366
1993	20.541224877354
1994	16.8093795283889
1995	15.1022864019254
1996	13.9032768115152
1997	13.3251332513325
1998	12.760527435134
1999	11.919891318638
2000	12.8127850259745
2001	12.7657981431566
2002	8.74950915646307
2003	9.33870585446788
2004	13.0155563176107
2005	12.3801345355661
2006	10.5812300512298
2007	9.00056932870969
2008	6.99363771542793
2009	4.3086727625381
2010	5.58464223385689
2011	7.84280936454849
2012	9.22800615770568
2013	12.0317638565814
2014	11.1074191864053
2015	2.30971422179968