Year	% of total electricity output
1990	40.3663347409763
1991	37.8481558941672
1992	39.6260877312821
1993	46.1806308259267
1994	39.2180896566693
1995	41.5655037276659
1996	42.9413252935844
1997	38.9105096034696
1998	38.334744465061
1999	29.9828237718997
2000	24.9387617873553
2001	19.8378488490528
2002	26.2488408037094
2003	25.2943143098996
2004	30.7309984206824
2005	24.5424683247302
2006	25.2536883362923
2007	19.031833700498
2008	17.3477204689091
2009	19.5783627291953
2010	26.3777887201242
2011	25.3268408364684
2012	27.2305174199152
2013	28.8231717980962
2014	20.8871937546386
2015	31.9566205597766