Year	% of total electricity output
1990	23.1293347660447
1991	28.8661098456087
1992	31.0869326901995
1993	32.4074074074074
1994	32.4074074074074
1995	35.3666318598445
1996	40.8921933085502
1997	34.0782272059805
1998	34.098603470165
1999	41.0655492367555
2000	35.1493848857645
2001	35.4397950469684
2002	33.5139760410724
2003	27.8544364644008
2004	29.5096322241681
2005	32.9878817788013
2006	30.0567418656287
2007	27.4610123119015
2008	25.9672558442616
2009	27.9461279461279
2010	31.7745771317104
2011	22.7934988428361
2012	25.6890879433801
2013	26.0636806281388
2014	32.9845123482629
2015	26.9051735603139