Year	% of total electricity output
1990	51.0001096010522
1991	44.300877730149
1992	52.333214559807
1993	52.9243289018018
1994	43.0287316047652
1995	47.5787798480036
1996	38.4015871774268
1997	48.2775491602214
1998	49.1828881989533
1999	48.2743254239915
2000	57.2467310698129
2001	51.5616200996318
2002	48.4969325153374
2003	43.3826516668021
2004	44.9493317861452
2005	51.2941622201875
2006	49.6007984031936
2007	52.0269044435336
2008	54.309045058508
2009	58.4199584199584
2010	55.3017647851273
2011	55.9446004765264
2012	59.0677497656757
2013	54.0334964811051
2014	55.8376857652682
2015	63.2627477135323