Year	% of total electricity output
1990	61.3589567604667
1991	60.2521566025216
1992	50.9456985967053
1993	57.0028818443804
1994	48.4536082474227
1995	45.44474393531
1996	43.5022579026593
1997	41.760391198044
1998	27.846425419241
1999	27.3776546629732
2000	21.3951509995747
2001	19.8015873015873
2002	24.5801526717557
2003	27.0562770562771
2004	27.7207392197125
2005	34.6116027531957
2006	30.0574345883855
2007	28.9900249376559
2008	35.525141326986
2009	30.9006660874602
2010	37.0046460781634
2011	33.9958158995816
2012	42.8181592656909
2013	52.3043686989918
2014	53.8686459739091
2015	50.0545970735969