Year	% of total electricity output
1990	8.42994312134495
1991	8.37365091179754
1992	8.30219707137761
1993	9.85098910180259
1994	13.824419778002
1995	12.4975622927949
1996	12.4174260645686
1997	12.4980769230769
1998	12.4956760606369
1999	12.9100172638848
2000	14.6734471202556
2001	14.2128497810296
2002	15.2377361077783
2003	13.5048382550966
2004	12.0352528194787
2005	11.5789939127743
2006	10.840531978732
2007	10.6673803493564
2008	9.28703922715899
2009	8.73967729640452
2010	9.70645887278271
2011	9.10424318019079
2012	8.23125074070483
2013	7.50538385425761
2014	7.87775535843454
2015	8.87402787692077