Year	% of total electricity output
1990	44.9260743768747
1991	44.5588664913818
1992	43.2534316738373
1993	38.3761797575327
1994	42.6813556157222
1995	40.7430166616922
1996	35.2778012684989
1997	35.4919153728582
1998	34.3109983493306
1999	29.3219823654606
2000	25.2422338363967
2001	26.1507662570758
2002	29.5241995138962
2003	33.3341581096128
2004	29.9793294327856
2005	32.9620096337673
2006	32.5343895410994
2007	30.0090946153605
2008	30.3265805099546
2009	29.4608681061694
2010	33.7038057297847
2011	29.9894836470712
2012	31.0605981794538
2013	31.0061877858488
2014	31.1025535574083
2015	31.4303497172134