Year	% of total electricity output
1990	12.52605555286248
1991	11.761024182076817
1992	11.79674804565429
1993	11.303799463976032
1994	9.87361636069114
1995	9.429316455287438
1996	9.514204642576326
1997	9.005341788785092
1998	8.547948335590897
1999	7.69099902841696
2000	6.666754647112072
2001	7.182560256198482
2002	6.710465983039343
2003	7.652324817605545
2004	7.266325634995504
2005	9.136004487435224
2006	8.843446536817163
2007	8.661121624681229
2008	5.197202417414151
2009	5.272211129020606
2010	5.887490407967902
2011	5.833884997305824
2012	5.811754223778577
2013	6.246783223861959
2014	5.407066182976607
2015	5.095515908645191