Year	% of total electricity output
1990	35.5450236966825
1991	36.9458128078818
1992	42.2110552763819
1993	41.249175548572
1994	43.75
1995	44
1996	39.010989010989
1997	42.0765027322404
1998	40.8376963350785
1999	35.1485148514851
2000	36.150234741784
2001	33.1896551724138
2002	40.6639004149378
2003	35.7429718875502
2004	40.9638554216867
2005	44.4897959183673
2006	44.6153846153846
2007	44.6189364442481
2008	39.4624930663563
2009	38.9836967567725
2010	28.898653902399
2011	39.0837085483288
2012	37.9151861048992
2013	38.4362159612216
2014	50.8075843846282
2015	60.0714356141205