Year	% of total electricity output
1990	9.65603064418908
1991	10.598201052793
1992	10.066865251436
1993	10.549143571271
1994	10.1944738557986
1995	9.62414281994155
1996	9.22972782400226
1997	9.58767572659215
1998	8.4340500156395
1999	8.54405358817839
2000	8.3816185720276
2001	8.09845495284596
2002	7.86091882240146
2003	8.44069886574851
2004	8.1866501908305
2005	8.80370663945662
2006	9.2993077726263
2007	8.64807246716794
2008	8.11525755637195
2009	7.49793425905399
2010	8.61187962842023
2011	10.4266522781963
2012	10.5926533603071
2013	13.2641083883167
2014	14.9067122095833
2015	13.6378410946741