Year	% of total electricity output
1990	7.052627110421118
1991	6.786301476139183
1992	6.593235532509918
1993	6.192166432497718
1994	5.436265592515588
1995	5.19049574394886
1996	5.264097223388711
1997	4.985356933388359
1998	4.669138719392872
1999	4.240543903581605
2000	3.697566413988817
2001	3.9876925544425763
2002	3.7395491008483726
2003	4.235518320595966
2004	4.079952459994346
2005	5.05519130349569
2006	4.913618722667793
2007	4.793486779239589
2008	2.8527651871493407
2009	2.888379069442707
2010	3.223074391526365
2011	3.19549263656622
2012	3.1497774441675683
2013	3.415429083128133
2014	2.961798447471168
2015	2.741456133671485