Year	% of total electricity output
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0.609756097560976
2007	0.497512437810945
2008	0.512820512820513
2009	0.469483568075117
2010	0.442477876106195
2011	0.432900432900433
2012	0.421940928270042
2013	0.411522633744856
2014	0.398406374501992
2015	0.398406374501992