Year	% of total electricity output
1990	12.52200881968114
1991	11.757375184218013
1992	11.79334608618751
1993	11.300745277283673
1994	9.870951417004044
1995	9.426881138973856
1996	9.512650872382286
1997	9.003959314385261
1998	8.546223892722539
1999	7.687130450417121
2000	6.6661302419271165
2001	7.181858016190398
2002	6.70788548862052
2003	7.645911157181426
2004	7.259794978338306
2005	9.126238409972121
2006	8.83734893928228
2007	8.654303737170727
2008	5.193255720325768
2009	5.267679717656065
2010	5.883084854380555
2011	5.828776349202366
2012	5.807790920389765
2013	6.242012282866942
2014	5.404571878051214
2015	5.092020057711514